Police in Prince George’s and Anne Arundel counties have arrested a man who they say was planning a mass shooting much like the one that killed 12 people at a screening of The Dark Knight Rises in Colorado a week ago. WJLA reports:

Law enforcement sources tell ABC 7’s Brad Bell that the suspect, who has yet to be identified, was arrested in Crofton on Thursday night. According to officials, the man was facing termination from his job in Prince George’s County.

Authorities say they found an “arsenal” of weapons in his home at the time of his arrest and that he had made threats directed toward his employer.

Other potential Colorado copycats have been found since the shooting, including one in Maine.