Police have arrested Jeffrey Michael Kelly, 60, in connection with three shootings targeting a Democratic National Committee office in Tempe, Arizona, since September.

Kelly is also accused of hanging bags of white powder from political signs lined with razor blades.

He faces multiple felony charges, including terrorism and unlawful discharge of a firearm.

A public tip led to his arrest.

Authorities found over 120 guns and 250,000 rounds of ammunition in his home, CBS News has reported.

Kelly’s bail was set at $500,000, and officials believe he was escalating toward an act of mass violence.

Written by B.C. Begley