(CNN) Around 1.2 million people, including 540,000 children, have been impacted by the 7.2-magnitude earthquake which struck southwestern Haiti on Saturday morning, according to UNICEF.

The quake left at least 1,941 people dead and more than 6,900 injured; that toll is expected to rise in the coming days, but search and rescue efforts are being hampered by a lack of resources and by heavy rains, which have caused mudslides that blocked roads in the region.

Tropical Storm Grace , which hit the same region late Monday "is further disrupting access to water, shelter, and other basic services," UNICEF said in a statement Tuesday. "Flooding and mudslides are likely to worsen the situation of vulnerable families and further complicate the humanitarian response."

On Tuesday, donor countries and humanitarian organizations increased efforts to help the country. The Pentagon announced it had formed a joint task force to assist USAID in disaster relief efforts, while the United Nation and the European Union allocated $8 million and $3.5 million respectively in aid to Haiti.

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Bruno Maes, UNICEF's representative in Haiti, said he had witnessed strong winds and heavy rainfall in the area affected by the earthquake.

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"Countless Haitian families who have lost everything due to the earthquake are now living literally with their feet in the water due to the flooding," he said. The agency is distributing tarpaulins, latrines, showers, water reservoirs and hygiene kits as part of a joint effort with partners, it said. There are no rainfall reports or radar observation data available out of Haiti, but CNN meteorologists estimate that roughly 2-4 inches (60-100 millimeters) of rain has fallen over the period from 11 a.m. EDT Monday to 11 a.m. EDT Tuesday, based on estimates from a NOAA satellite. Satellite imagery continues to show thunderstorms impacting western parts of Haiti, said CNN senior meteorologist Dave Hennen. Rain will likely continue over the quake zone until late afternoon or evening Tuesday, he added. 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Aftershocks and mudslides have obstructed the roads between the cities of Les Cayes and Jeremie, with repairs underway. Grace restrengthens into a tropical storm as it threatens the Caribbean with flooding and mudslides Saturday's quake destroyed and damaged tens of thousands of homes, according to the civil protection agency. It also blocked roads and wrecked infrastructure, making it difficult for vital supplies to reach the affected areas. Local hospitals have told CNN that they are inundated with victims, and desperately in need of medical supplies. Pentagon press secretary John Kirby said on Tuesday that US relief efforts were focused on "getting a clear picture of what the situation looks like on the ground... so that we can best coordinate and integrate USAID and other agency assistance to the people of Haiti." Kirby added that four field hospitals from US Southern Command would be set up in southern Haiti later this week. Sarah Charles, assistant to the administrator of USAID's Bureau for Humanitarian Assistance, told reporters on Tuesday that its response team to Haiti included 38 disaster experts, as well as 65 search and rescue members and four canines from the Fairfax County Fire Department's Urban Search and Rescue team -- who arrived in Haiti on Sunday. Thousands of pounds of specialized equipment and medical supplies have also been deployed, along with food and hygiene relief supplies, she added. The earthquake is just the latest challenge for the struggling country, which was shaken in 2010 by a disastrous 7.0-magnitude quake that killed an estimated 220,000 to 300,000 people. Charles noted that they do not currently expect the current death toll to reach as high this time, although it's likely "that number will climb in the coming days." "There are, though, significant humanitarian needs, and we're doing everything we can to respond and respond at scale to those needs," Charles said. The earthquake struck at 8:30 a.m. local time on Saturday, at a depth of about 10 kilometers (6.2 miles); its epicenter was about 12 kilometers (7.5 miles) northeast of Saint-Louis-du-Sud in the southwest part of the country. Photos: Deadly earthquake devastates Haiti A funeral procession is held for an earthquake victim in L'Asile, Haiti, on Wednesday, August 18. Hide Caption 1 of 23 Photos: Deadly earthquake devastates Haiti People wait in line for food to be distributed in Les Cayes, Haiti, on Thursday, August 19. Hide Caption 2 of 23 Photos: Deadly earthquake devastates Haiti A coffin under construction sits in the backyard of carpenter Chery Jeanne's home in Les Cayes on August 19. Jeanne had already built five coffins for earthquake victims. Hide Caption 3 of 23 Photos: Deadly earthquake devastates Haiti Severely damaged homes are seen along a road in Rampe, Haiti, on August 18. Hide Caption 4 of 23 Photos: Deadly earthquake devastates Haiti Members of the US Coast Guard assist an earthquake victim who had just arrived at the international airport in Port-au-Prince, Haiti, on Tuesday, August 17. Hide Caption 5 of 23 Photos: Deadly earthquake devastates Haiti A soldier walks over rubble in Les Cayes, Haiti, on August 17. Hide Caption 6 of 23 Photos: Deadly earthquake devastates Haiti A woman walks in a flooded area of Les Cayes on August 17. Tropical Storm Grace moved across the southern coast of Hispaniola, the island comprising Haiti and the Dominican Republic, just days after the earthquake. The storm "is further disrupting access to water, shelter, and other basic services," UNICEF said in a statement Tuesday. "Flooding and mudslides are likely to worsen the situation of vulnerable families and further complicate the humanitarian response." Hide Caption 7 of 23 Photos: Deadly earthquake devastates Haiti People build makeshift tents at a football stadium in Les Cayes after spending the night outside. Hide Caption 8 of 23 Photos: Deadly earthquake devastates Haiti An injured woman is transported to a hospital in Les Cayes on Monday, August 16. Hide Caption 9 of 23 Photos: Deadly earthquake devastates Haiti An aerial view of collapsed buildings in Les Cayes. Hide Caption 10 of 23 Photos: Deadly earthquake devastates Haiti People wait to collect water in Camp-Perrin, Haiti, on August 16. Hide Caption 11 of 23 Photos: Deadly earthquake devastates Haiti A woman recovers her belongings at a flooded refugee camp. Emergency officials were bracing for heavy rains and floods as Tropical Depression Grace moved toward Haiti. Hide Caption 12 of 23 Photos: Deadly earthquake devastates Haiti A crowd in Les Cayes waits to receive humanitarian aid provided by the Fund for Economic and Social Assistance. Hide Caption 13 of 23 Photos: Deadly earthquake devastates Haiti Residents of Les Cayes, Haiti, survey a damaged structure on Sunday, August 15, a day after a 7.2 magnitude earthquake struck the country. Hide Caption 14 of 23 Photos: Deadly earthquake devastates Haiti Firefighters search for survivors inside a collapsed building in Les Cayes on August 15. Hide Caption 15 of 23 Photos: Deadly earthquake devastates Haiti A woman sits in front of a destroyed house in Les Cayes on August 15. Hide Caption 16 of 23 Photos: Deadly earthquake devastates Haiti A man rides through water-logged streets in Les Cayes on August 15. Hide Caption 17 of 23 Photos: Deadly earthquake devastates Haiti Oxiliene Morency cries out in grief after the body of her 7-year-old-daughter, Esther Daniel, was recovered from the rubble of their home in Les Cayes on Saturday, August 14. Hide Caption 18 of 23 Photos: Deadly earthquake devastates Haiti People displaced from their homes spend the night outside a hospital in Les Cayes on August 14. Hide Caption 19 of 23 Photos: Deadly earthquake devastates Haiti An injured woman is transferred to a plane to be flown to Port-au-Prince, Haiti, on August 14. Hide Caption 20 of 23 Photos: Deadly earthquake devastates Haiti People walk past a Les Cayes home on August 14. Hide Caption 21 of 23 Photos: Deadly earthquake devastates Haiti A man uses a sledgehammer in an attempt to rescue people from the remains of a home in Les Cayes on August 14. Hide Caption 22 of 23 Photos: Deadly earthquake devastates Haiti A man recovers belongings from his Les Cayes home, which was destroyed by the earthquake. Hide Caption 23 of 23