Nationwide protests at the police killing of a young ethnic Pashtun man in Pakistan’s largest city shines a spotlight on allegations of persecution by the authorities against refugees from the country’s conflict-ridden northwest.

Pakistan Police say they arrested a man suspected to be a serial killer responsible for the rape and murder of a seven-year-old girl, a case that ignited nationwide protests over allegations of government inaction.

A suicide bomber on a motorcycle killed a top Pakistani police officer and one of his guards in the city of Peshawar, police say.