Kabul, Afghanistan ? More than 250 Afghans were arrested after a riot in Kabul last week that killed about 20 people, the intelligence chief said Wednesday. A roadside bomb killed three Afghan troops, and the U.S.-led coalition confirmed the deaths of two American soldiers.

Amrullah Saleh said that 141 Afghans remain in custody and that 52 have confessed to crimes committed during the May 29 riot, which was sparked by a deadly crash involving a U.S. military vehicle.

A U.S. military spokesman, Col. Tom Collins, meanwhile, said Afghan investigators will have “full access” to U.S. equipment and to soldiers for interviews during the inquiry into the crash.

The crash, which killed up to five people and involved several cars, was caused by a U.S. military truck whose brakes failed, the U.S. military has said.