Brazil ? Rescue crews worked through the night to retrieve a minibus with at least four people inside trapped under tons of earth and rubble following the collapse of a Sao Paulo subway station construction site.

Rescuers Monday found the bodies of two women buried in the crater that was created when the walls of a huge hole being excavated for the station collapsed Friday. Hope that anyone else still could be alive was almost nonexistent, officials said.

Rescue crews first found the body of Abigail Rossi de Azevedo, 75, who was walking near the site when its concrete walls collapsed. Several hours later they spotted the body of a second, unidentified woman inside the minibus but did not remove her.

Three other people were believed to have been inside the minibus, which is entombed some 300 feet below ground level. A pedestrian and a truck driver also were feared buried.

Workers have been unable to pull the minibus out from underneath the rubble due to the risk of another collapse.