there have been four since december 31st, including pumping gas into police offices, rigging a firearm to a gate at the police station. the gun did go off but the bullet missed. there was an explosive device attacked to an officer's car a scary incident. as for who may be responsible, well, police say they believe it's gang-related. there was a 911 caller who suggested it could be a very popular, well-known motorcycle gang, the vogos gang, and perhaps they are retaliating over a gang crackdown. police don't have evidence to suggest that gang. they're offering a $200,000 reward. >> anita vogel, thank you very much. >> while she was speaking, we're working on urgent news from washington regarding threats against members of the congress and their votes on the healthcare insurance overhaul law. it's now a law and there are