American military helicopters started ferrying tons of aid Sunday to a northern Philippine mountain region facing shortages of food, gasoline and coffins after back-to-back typhoons killed more than 600 in the country, according to AP. Four Marine CH-46 helicopters were flying to Baguio city, which along with nearby provinces was devastated by storm-triggered mudslides that have blocked three key access roads to the area, isolating the upland region. The U.S. military was responding to a request from the Philippines to help deal with the nationwide aftermath of two major storms since Sept. 26. Tropical Depression Parma blew out of the country's mountainous north late Saturday, allowing U.S. troops to start airlifting food aid to Baguio. Philippine officials asked U.S. troops, which were in the country for an annual war exercise, to help with relief operations. About 700 Marines and sailors were on hand to help out, said Marine Capt. Jorge Escatell, a U.S. military spokesman. The helicopters flew to northern San Fernando township, where they picked up about 10 tons of food that will be delivered to Baguio, Escatell said. The floods and landslides killed at least 53 people in Baguio, a summer tourist destination 130 miles (210 kilometers) north of Manila known for its cool climate. Rescuers continued to dig through a huge mound of mud in Crescencia village in search of more than 10 still-missing residents, Baguio city police chief Agrifino Javier said.