Thirteen killed in red mosque blast

"Most of the dead were policemen," a security official said. More than 50 people were injured.Torn police uniforms lay about the scene in Islamabad while blood stained the streets, a BBC correspondent said.
The mosque was the scene of a bloody siege that ended earlier in July with the deaths of more than 100 people.
A protest grew on Friday as students demanded the return of the mosque's surviving pro-Taleban cleric, Abdul Aziz, who is in detention. Security forces initially stood by as the protesters emerged from the mosque chanting "[President Pervez] Musharraf is a dog!", and calling for an Islamic revolution. More