MINEOLA - Police have arrested nine owners of gun shops in Nassau County for allegedly selling illegal weapons after modifying them to appear legal.

Nassau County District Attorney Kathleen Rice says during a 10-month investigation, the owners of five licensed gun stores sold illegal weapons to investigators and members of the state police.

Authorities say an undercover video gave them the proof they needed to expose the suspects, who are now facing a slew of charges related to selling illegal assault weapons.

Police recovered more than 40 illegal weapons from T&T Gunnery, T&T Tactical, Hunter Sports, Coliseum Gun Traders and South Shore Sportsmen during a raid yesterday.

In the video, officials say Martin Tretola, who owns T&T Gunnery and T&T Tactical, is showing undercover officers how to modify an assault rifle to make it look legal.

"There is no place for weapons like this on our streets in Nassau County," Rice said.

All nine suspects, Mark Wroobel, Andrew Chernoff, Carmine Rotondo, Michael Marinello, Martin and Thomas Tretola, Stuart Sansevino, Hank Greenberg and Morgan Owens were arraigned today.