Brazil ? Rescue crews aided by dogs searched into the night Saturday for occupants of a minibus and other possible victims feared buried in a huge crater after the earth gave way at a construction site for a new subway station.

Witnesses told police that a minibus with a driver, fare collector and two passengers fell into the crater when a 130-foot-wide circular hole lined with concrete walls at the site collapsed Friday, said Etrusco Juarez, a spokesman for Sao Paulo’s state public security department.

Two pedestrians and a truck driver who was working at the construction site were also missing and may be buried under the rubble, the government’s Agencia Brasil news agency said.

The search effort continued after darkness set in Saturday, and authorities said it was possible there were still survivors more than 24 hours after the accident. But rescuers had not found any sign of the minibus or possible victims by late Saturday night.