SAN FRANCISCO (AP) — Northern California police are on the hunt for vandals they say have egged at least a dozen homes and vehicles in the past month.

KTVU-TV reported Tuesday (http://bit.ly/2v80BIb ) that Brentwood Police have several surveillance clips of the vandalism, including one of a male practicing a wind-up before unleashing at least three raw eggs.

Brentwood Police Lt. Walter O'Grodick said anyone who causes at least $400 worth of damages could face felony charges.

Investigators say more than 20 incidents have been reported, with some households suffering multiple times. The egg-throwing occurs between 1:30 a.m. and 4:30 a.m. Police say the incidents have been sporadic and without pattern.

Brentwood is a small city about 50 miles (80 kilometers) east of San Francisco.

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Information from: KTVU-TV.