MONROVIA — A SWAT team used tear gas and flash-bang grenades to bring an end to a 12-hour standoff with an armed ex-felon early Wednesday, police said.

David Hipkins, 35, was arrested on suspicion of being an ex-felon in possession of firearms shortly after 1 a.m. at his home in the 800 block of West Duarte Road, Monrovia police Sgt. Mike Head said.

The stand-off began about 1:20 p.m. Tuesday when police received a report that Hipkins was distraught and had made threats of harming himself, police said.

Authorities summoned a SWAT team after Hipkins, who was believed to have weapons, refused to come out of the home.

After 12 hours of sporadic communication with Hipkins, police fired tear gas and flash-bang grenades into the home, Head said.

After several volleys of grenades, he said, Hipkins finally exited the home and surrendered.

Several guns were found inside the home, though the number and type of weapons were not available Wednesday morning.