BRENTWOOD, N.H. (AP) — Four New Hampshire police officers are suing the mother of the man accused of shooting them and killing Greenland’s police chief in April.

Chief Michael Maloney was killed and the four other officers were wounded while trying to serve a warrant at the home of Cullen Mutrie on April 12. Authorities say Mutrie killed a woman in the home before killing himself later that night.

In a lawsuit filed in Rockingham County Superior Court, the officers argue that Beverly Mutrie wantonly allowed criminal activity to occur at the home, which she owns. Mutrie’s lawyer has filed a motion to dismiss the lawsuit, saying Mutrie had no knowledge of criminal activity and that owning the property doesn’t make her responsible for the violence that occurred.

Copyright 2012 The Associated Press.