BOSTON (AP) – Boston lawmakers have imposed new restrictions on city police in their work on federal immigration matters.

The City Council approved amendments Wednesday to Boston’s Trust Act, which limits the role city officials play in enforcing the nation’s immigration laws.

Democratic Mayor Marty Walsh says the amendments, which his office helped develop, are meant to reassure residents that Boston police remain focused on public safety, not civil immigration enforcement.

The changes come amid revelations that Boston police have been closely coordinating with U.S. Immigration and Customs Enforcement despite the Trust Act. A spokesman for ICE’s Boston office didn’t comment.