A bomb has ripped through offices of Turkey's ruling Justice and Development Party (AKP) on the outskirts of Istanbul, injuring two people, a local party official said. There was no immediate claim of responsibility, but the explosion happened against the background of a week of street clashes between police and Kurdish protesters in which 16 people have died. Much of the demonstrators' anger over high unemployment, poverty and Ankara's refusal to grant more autonomy to the mainly Kurdish region has been targeted against the government, and AKP offices have been damaged in the latest protests.