Pedestrians watch as Los Angeles police take part in a counterterrorism drill in downtown Los Angeles on Thursday June 6, 2013. Thursday's late-morning demonstration by the LAPD began w

 

              Pedestrians watch as Los Angeles police take part in a counterterrorism drill in downtown Los Angeles on Thursday June 6, 2013. Thursday
Pedestrians watch as Los Angeles police take part in a counterterrorism drill in downtown Los Angeles on Thursday June 6, 2013. Thursday's late-morning demonstration by the LAPD began with an explosion, officers firing blank ammunition at pretend suspects, and law enforcement helicopters flying low among downtown office towers. (AP Photo/Nick Ut)