McALLEN, Texas (AP) Anthropologists have uncovered dozens of makeshift graves in a South Texas cemetery suspected of holding the remains of unidentified immigrants who died in the desert while attempting to cross the U.S.-Mexico border.

Authorities plan to investigate the 52 graves, many of which were unmarked and had remains not in coffins but in body bags, garbage bags and shopping bags and some in no container at all. Some of the bags contained more than one set of remains.

Baylor University anthropologist Lori Baker believes the graves in Falfurrias were dug from 2005 to 2009 and the migrants buried by a local funeral home.

Smugglers often guide immigrants through the brush trying to circumvent a Border Patrol highway checkpoint. There is little water, and the walk can take two or three days in punishing temperatures.