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(CNN)Since Saudi-led coalition airstrikes and intense fighting began in Yemen in late March, it's estimated that 600 people have been killed. Even more have been wounded, and tens of thousands of civilians have been displaced.
The International Committee of the Red Cross called for an immediate 24-hour ceasefire, to allow humanitarian aid in the most needed areas.
"Otherwise, put starkly, many more people will die. For the wounded, their chances of survival depend on action within hours, not days," Robert Mardini, the ICRC's head of operations in the Near and Middle East, said.
As fighting continues in Yemen, several organizations are trying to help provide food, water and medical supplies that are desperately needed.
While groups are trying to deploy the necessary resources to Yemen, some have had to temporarily evacuate their staffs for security reasons. They have vowed to respond to those in need as soon as it is possible. Here's how you can help:
Photos: Unrest in Yemen
Photos: Unrest in Yemen
The sky over Sanaa, Yemen, is illuminated by anti-aircraft fire during a Saudi-led airstrike on Friday, April 17. The coalition's warplanes have been carrying out strikes against Houthi rebels since President Abdu Rabu Mansour Hadi fled the country in late March.
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Photos: Unrest in Yemen
A Yemeni boy holds a rifle as Houthi supporters attend a rally in Sanaa, Yemen, on Sunday, April 5, protesting airstrikes carried out by a Saudi-led coalition against Houthi rebels.
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Photos: Unrest in Yemen
Yemenis dig graves on Saturday, April 4, to bury the victims of a reported airstrike by the Saudi-led coalition in the village of Bani Matar, Yemen.
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Photos: Unrest in Yemen
Yemenis search for survivors in the rubble of houses destroyed by Saudi-led airstrikes on April 4 in a village near Sanaa.
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Photos: Unrest in Yemen
Central Sanaa is covered in dust on Friday, April 3. Airstrikes have turned the bustling capital of Yemen into a ghost town.
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Photos: Unrest in Yemen
A Yemeni man loads a TV set into a van as he prepares to flee Sanaa on Thursday, April 2.
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Photos: Unrest in Yemen
Militiamen loyal to Hadi take positions on a street in Aden, Yemen, on Thursday, April 2. Houthi rebels seized the presidential palace in Aden, a neutral security official and two Houthi commanders in Aden told CNN. The Houthis are Shiite Muslims who have long felt marginalized in the majority Sunni country. The Sunni Saudis consider the Houthis proxies for the Shiite government of Iran and fear another Shiite-dominated state in the region.
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Photos: Unrest in Yemen
A framed photo and a purse hang on the wall of a house destroyed by an airstrike near the Sanaa airport on Tuesday, March 31.
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Photos: Unrest in Yemen
Buildings burn at the Jabal al-Hadid military camp in Aden on Saturday, March 28. Yemeni military officials said an explosion rocked the camp that houses a weapons depot, killing and wounding several people. The camp reportedly had been taken by security forces loyal to former Yemeni President Ali Abdullah Saleh. Some of the forces aligned with the Houthis are also loyal to Saleh, who resigned in 2012 after months of Arab Spring protests.
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Photos: Unrest in Yemen
Yemeni supporters of the Houthi movement attend a demonstration against Saudi military operations Thursday, March 26, in Sanaa.
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Photos: Unrest in Yemen
People search for survivors under the rubble of houses destroyed by airstrikes near the Sanaa Airport on March 26.
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Photos: Unrest in Yemen
Members of Yemen's General People's Committee deploy in Aden, Yemen, on Wednesday, March 25. The militiamen are loyal to Hadi.
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Photos: Unrest in Yemen
On March 25, honor guards in Sanaa carry the coffins of victims who were killed in suicide bombing attacks several days earlier. Deadly explosions in Sanaa rocked two mosques serving the Zaidi sect of Shiite Islam, which is followed by the Houthi rebels that took over the capital city in January.
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Photos: Unrest in Yemen
Yemenis stand in front of burning tires during an anti-Houthi protest in Taiz, Yemen, on Tuesday, March 24.
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Photos: Unrest in Yemen
Medics treat an anti-Houthi protester who was injured during clashes with pro-Houthi police in Taiz on March 24.
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Photos: Unrest in Yemen
Armed men inspect damage after an explosion at the Al Badr mosque in Sanaa on Friday, March 20.
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Photos: Unrest in Yemen
A man in Aden holds a police shield that he looted from a base belonging to forces loyal to Saleh on Thursday, March 19.
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Houthi supporters in Sanaa deploy giant national flags Wednesday, March 18, during a demonstration to mark the fourth anniversary of the "Friday of Dignity" attack. In 2011, forces loyal to Saleh opened fire on protesters who had gathered in Sanaa to demand the ouster of Saleh and his regime.
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Photos: Unrest in Yemen
Supporters of Ahmed Ali Abdullah Saleh, the son of the former President, wave banners and shout slogans during a demonstration in Sanaa on Tuesday, March 10. The demonstrators were demanding presidential elections be held and that the younger Saleh run for office.
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Photos: Unrest in Yemen
A child raises his fist during a rally by Houthi supporters in Sanaa on Friday, March 6.
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Photos: Unrest in Yemen
Thousands of armed Yemeni tribal members gather in the southern province of Shabwa on Monday, February 23.
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Photos: Unrest in Yemen
Supporters of the separatist Southern Movement perform prayers during a demonstration in Aden on Friday, February 13.
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Photos: Unrest in Yemen
Houthi fighters guard the gate of the presidential palace where a bomb went off and wounded three people in Sanaa on Saturday, February 7.
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Photos: Unrest in Yemen
Yemeni soldiers guard the presidential palace in Sanaa on Friday, February 6.
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Photos: Unrest in Yemen
Members of the Houthi movement and their allies attend a meeting in the Yemeni capital on Sunday, February 1.
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Photos: Unrest in Yemen
Supporters of the separatist Southern Movement flash the victory sign after they seized police security checkpoints on Saturday, January 24, in Ataq, the capital of the Shabwa province in Yemen. Policemen were told to give up their weapons and return to their bases before the militiamen raised flags of the formerly independent South Yemen at the checkpoints.
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Houthi rebels fight with Yemeni protesters during a rally in Sanaa on January 24. Thousands of Yemenis took to the streets of Sanaa in the largest demonstration against Houthis since the Shiite militiamen overran the capital in September.
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Photos: Unrest in Yemen
On Friday, January 23, Houthis carry coffins of those killed during recent clashes with presidential guard forces in Sanaa.
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Photos: Unrest in Yemen
A Houthi militiaman sits near a tank near the presidential palace in Sanaa on Thursday, January 22.
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Photos: Unrest in Yemen
Houthi men wearing army uniforms stand guard on a street leading to the presidential palace in Sanaa on Wednesday, January 21.
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Photos: Unrest in Yemen
A wounded man rests at a hospital in Sanaa on January 21. He was reportedly injured in fierce clashes the previous day.
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Photos: Unrest in Yemen
A tank is stationed in front of the Sanaa house of President Abdu Rabu Mansour Hadi on January 21.
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A Houthi rebel mans a checkpoint near the presidential palace on January 21.
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A man walks inside a heavily damaged house near the presidential palace on Tuesday, January 20.
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A woman walks past closed shops in Sanaa on January 20.
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Photos: Unrest in Yemen
An armed member of the Houthi movement stands guard in the streets of Sanaa on January 20.
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A man surveys his damaged home in Sanaa on January 20.
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Photos: Unrest in Yemen
Houthis inspect a damaged mosque in Sanaa on January 20.
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Houthi men raise their weapons during clashes near the presidential palace on Monday, January 19.
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Smoke and flames rise in Sanaa during heavy clashes between presidential guards and Houthi rebels on January 19.
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Tribal soldiers protecting the city from Houthi rebels stand guard at the city borders in Marib, Yemen, on January 19.
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Photos: Unrest in Yemen
Houthi men guard a Sanaa street on January 19.
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