Arrests and aggressive tactics by ICE and the Border Patrol, many seen on viral videos, have intensified the frustration and fear among residents.

The temporary protections, which are meant to help migrants who cannot safely return to their countries, are expected to expire for Somalis on March 17.

Joseph H. Thompson, a career federal prosecutor who was the acting U.S. attorney for Minnesota last year, was among those who resigned as the Justice Department sought to examine the woman’s supposed ties to activist groups.