Police arrested 11 bus drivers around the New York area suspected of using phony aliases to get fraudulent driver licenses, officials said. The crackdown comes on the heels of a horrific bus accident that left 15 passengers dead.

Authorities suspended the license of a bus driver — who has not been charged with a crime — after police said his driver’s license application was found to contain false statements. A joint investigation by the New York Department of Motor Vehicles (DMV) and police uncovered similar incidents.

Among those arrested were Metropolitan Transportation Authority (MTA) employees and commercial drivers, the statement said. All 11 drivers were charged with falsifying business records and offering a false instrument for filing.

“This investigation is ongoing and our investigators will continue to identify and arrest all those who have submitted false identities,” said the DMV’s executive deputy commissioner.

MTA has suspended the suspects’ driving privileges pending the outcome of criminal hearings.