Philadelphia police attacked by ATV, dirt-bike riders who hurled bricks and bottles at officers  Fox NewsWatch: Dirt Bike, ATV Riders Throw Bricks at Philly Cop Cars  NBC 10 PhiladelphiaIllegal dirt bike and ATV rallies concern Philadelphians  CBS PhiladelphiaDirt bike rider wanted for throwing brick at police SUV in Northern Liberties  PhillyVoice.comPhiladelphia police search for suspect who threw brick at patrol car during ATV incident on Delaware Avenue  WPVI-TVView Full Coverage on Google News