A gunman is in custody after opening fire on police as they were serving a drug warrant in Philadelphia, wounding six officers and triggering a standoff that extended into the night, authorities said.

Two black men who were arrested for sitting at a Philadelphia Starbucks without ordering anything have settled with the city for a symbolic single dollar each, and a promise from officials to set up a $200,000 programme for young entrepreneurs.

Money is being raised to repair and restore more than 100 headstones that were vandalised at a Jewish cemetery in Philadelphia.

The suspect in the shooting of a Philadelphia policeman told investigators he shot the officer in the name of Islam and pledged allegiance to the Islamic State group, according to US police.