Eight students from Islamabad's Red Mosque, or Lal Majid, three policemen and a TV cameraman have been killed after students from the mosque clashed with Pakistani security forces.
Students also set fire to two government buildings, including the ministry of environment, as the violence intensified.
Maulana Abdul Rashid Ghazi, the mosque's deputy leader, said: "They [the security forces] are behaving brutally. So far eight of our students have been killed."
After a few hours of relative lull, clashes erupted again late on Tuesday night.
Kamal Hyder, Al Jazeera's correspondent in Islamabad, said that a ceasefire agreed by the two sides has been broken.
A doctor at a nearby hospital said that about 60 people had been taken there during the clashes.
Most were suffering from the effects of tear gas, but they also included several students, bot
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