One hundred and twenty-six people are dead in Peshawar, Pakistan, including 84 children after Taliban gunmen attacked a school Tuesday morning.

There were 500 children and teachers believed to be inside of the building. The injured number as of now is 122, while an unknown amount of people still remain inside of the school, according to Sky News.

"Rescue operation by troops under way. Exchange of fire continues. Bulk of student(s) and staff evacuated. Reports of some children and teachers killed by terrorist," the army said in a brief English-language statement.

"We selected the army's school for the attack because the government is targeting our families and females," said Taliban spokesperson Muhammad Umar Khorasani. "We want them to feel our pain."

"We were standing outside the school and firing suddenly started and there was chaos everywhere and the screams of children and teachers," a school bus driver said.

Although the school is army-run, the majority of the students are civilians, according to Sky News.

British Prime Minister David Cameron called the attack "deeply shocking."

"It's horrifying that children are being killed simply for going to school."