Four officers were killed in a shooting while attempting to serve a warrant at a home in Charlotte, North Carolina, including one deputy US marshal and two local task force officers, authorities say.

A total of eight law enforcement officers were shot during the incident, Charlotte-Mecklenburg Police Chief Johnny Jennings said at a Monday evening news conference. He described the shooting as “the most tragic one” he had been involved with in his 32-year-long law enforcement career.

The shooting unfolded in the 5000 block of Galway Drive as members of the US Marshals Fugitive Task Force were serving a warrant for possession of firearm by a convicted felon, Jennings said.