Pakistani authorities are trying to identify the remains of a suicide bomber who killed 14 people during a blast near Islamabad's radical Red Mosque.

Officials from the country's Interior Ministry say security in the area has been tightened and that a team has been assembled to investigate the blast.

Friday's attack took place at a restaurant near the complex, shortly after hundreds of Islamic students clashed with security forces.

Officials say most of the victims were police officers.

Hundreds of people re-occupied Islamabad's Lal Masjid (Red Mosque) Friday morning demanding the return of the pro-Taleban mosque's former cleric, Abdul Aziz, who is in police custody.

The government reopened the mosque Thursday, two weeks after a deadly raid on the compound.

More than 100 people, including a top radical cleric, Abdul Rashid Ghazi, died during an eight-day siege of the mosque compound.

Radical clerics led the school's students in an aggressive campaign to impose strict Islamic law in Pakistan.

Pakistani officials say the mosque is now closed indefinitely.

Some information for this report was provided by AFP, AP and Reuters.