(CNN) -- A group of gunmen have stormed an army-run school in the Pakistani city of Peshawar, killing at least 22 people -- including 17 children.
The Pakistan Taliban -- Tehreek e Taliban Pakistan (TTP) -- claimed responsibility for the attack Tuesday.
Two teachers and an army official were also among those killed, while 47 people were wounded, according to Shehram Khan, health minister for the northwestern province of Khyber Pakhtunkhwa.
The Pakistan military said a rescue operation involving its troops is currently underway at the school, with gunfire being exchanged. It added that the bulk of the students and staff have now been evacuated.
In a telephone call to CNN, a spokesman for the TTP, who identified himself as Mohammed Khurrassani, claimed that six suicide bombers entered the school compound with orders to kill older students.
He said the attack was revenge for the "Zarb e Azb, Khyber-1 military operation and revenge of dumped bodies of detained prisoners."
For the past few months, the Pakistan military has been conducting a ground offensive aimed at clearing out militants in its restive regions along the border with Afghanistan. The campaign has displaced tens of thousands of people.
Northwestern Pakistan is home to loosely governed tribal areas. It's also a base for foreign fighters and a refuge for members of the Taliban and other militant groups.
http://edition.cnn.com/2014/12/16/world/asia/pakistan-peshawar-school-attack/index.html?hpt=hp_t1
According to CNN 700 people could still be in the building.
Update
PESHAWAR: Taliban militants have entered an army-run school on Warsak road, taking students and teachers hostage.
Five to six terrorists have entered the Army Public School
104 including 84 children killed, scores injured
Firefight, evacuation underway
About 500 students and teachers are believed to be inside
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