The killing of U.S. Border Patrol Agent David Maland is tied to a cultlike group that federal prosecutors have linked to five other homicides in Vermont, Pennsylvania and California.

A traffic stop in Vermont has cracked open a cultlike group called Zizians linked to six deaths in three states

Agent David “Chris” Maland died in a shooting following a traffic stop, the FBI said. A second person killed in the incident was a German national in the country on a current visa, authorities said.