Over 120 Pakistanis, mostly children, killed in Taliban high school attack

(Reuters) - At least 126 people, most of them children, were killed on Tuesday when Taliban gunmen stormed a school in the Pakistani city of Peshawar, taking hundreds of students hostage in the bloodiest insurgent attack in the country in years.

Troops surrounded the building and an operation was underway to rescue children still trapped inside, the army said.

Hours into the siege, three explosions were heard inside the military-run high school, and a Reuters journalist at the scene said he heard heavy gunfire.

Outside, as helicopters rumbled overhead, police struggled to hold back distraught parents who were trying to break past a security cordon and get into the school.

Bahramand Khan, director of information for the regional Chief Minister's Secretariat, said at least 126 people were killed and 122 wounded.