SELDEN - Wake services were held in Selden today for a Nassau County police officer who was killed in a friendly fire shooting over the weekend.

Police say Bureau of Special Operations officer Geoffrey Breitkopf was mistakenly shot by an MTA officer in Massapequa Park Saturday.

The incident happened 10 minutes after other Nassau police officers had shot and killed a suspect armed with a knife.

As News 12 Long Island has reported, witnesses say a retired NYPD cop who was at the scene panicked and yelled "gun" when he saw Breitkopf, dressed in plain clothes, carrying his service rifle.

PBA President Jim Carver said today the Nassau County district attorney should consider bringing criminal charges against the retired officer.

Breitkopf's wake continues through tomorrow at the Selden Fire Department headquarters, where he was also a volunteer.

His funeral will be held Friday at Saint Margaret of Scotland Catholic Church in Selden.

Police probe shooting death of Nassau County copPolice: Nassau cop was accidentally shot by MTA officerOfficer dies in Massapequa Park shooting