PPP workers and the police clashed in Islamabad outside the NAB office ahead of PPP leaders' Asif Zardari and Bilawal Bhutto Zardari appearance before the bureau. Around 35 workers have been arrested and shifted to police stations around the city. The workers are trying to get to the NAB office from NADRA Chowk. Some jumped out of the moving police van and fled. The Zardaris are scheduled to appear before NAB at 11am.