At least 20 Pakistani soldiers were killed on Sunday when an explosion hit an army convoy in the northwestern region of Bannu, intelligence and military sources said.
The Pakistani Taliban claimed responsibility for an attack on a military convoy. "We claim responsibility for the attack, which was part of our fight against a secular system," Tehreek-e-Taliban Pakistan spokesman Shahidullah Shahid told AFP by telephone from an undisclosed location.
"We will carry out more such attacks in future," they warned.
A police officer said the blast took place as a convoy of army troops and paramilitary Frontier Corps was preparing to leave Bannu, adding that security forces had cordoned off the area to investigate.
"We fear that dozens were killed and injured," said an intelligence source. "It is not yet clear what caused the blast... A large number of soldiers were there."