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A soldier escorts schoolchildren after they were rescued from the Army Public School that is under attack by Taliban gunmen in Peshawar, December 16, 2014. Image Credit: REUTERS

Peshawar: Pakistani police at a high school being attacked by the Taliban on Tuesday in the northwestern city of Peshawar said they heard three explosions.

Police were struggling to hold back distraught parents trying to break past a cordon and get to the school when three loud explosions went off, police officials told Reuters.

At least 100 children have been killed in the attack and many more are missing. The Taliban say they sent in six gunmen wearing suicide vests.