Nearly 400 prisoners escaped from a jail in northwest Pakistan early on Sunday after it was attacked by Islamist militants armed with guns and rocket propelled grenades, a senior police official said.
Some of those who fled the jail in the town of Bannu, near unruly ethnic Pahstun tribal areas close to the Afghan border, were militants, an intelligence official said.
Pakistan's al Qaeda-linked Taliban movement, which has close links to al Qaeda, said its fighters mounted the assault, which triggered clashes. Several people were wounded.
"We have freed hundreds of our comrades in Bannu in this attack. Several of our people have reached their destinations, others are on their way," a Taliban spokesman said.
The claim could not be immediately verified.
If the al Qaeda-linked Taliban freed the prisoners, it could deal a psychological blow to Pakistani security forces following government assertions that security crackdowns have weakened the group.
While the Taliban in neighbouring Afghanistan have staged several jailbreaks, such operations are rare in Pakistan, one of the most unstable countries in the world.
Pakistan is seen as critical to U.S. efforts to stabilise Afghanistan. Yet the South Asian nation faces its own major security challenges.
The Tehrik-e-Taliban Pakistan (TTP), or Taliban Movement of Pakistan, is seen as the biggest threat, staging suicide bombings and shootings in a drive to impose its harsh version of Islam in the nuclear-armed country.
Major suicide bombings have eased in recent months, but it is unclear whether that is due to military gains or a shift in Taliban tactics.
A loose alliance of a dozen groups, the TTP began its battle against the state in 2007, after a bloody army raid on Islamabad's Red Mosque, which was controlled by its allies.
Police and intelligence officials said only some of the prisoners who escaped were militants.
"Dozens of militants attacked Bannu's central jail in the early hours of the morning, and over 300 prisoners have escaped," senior police official Mir Sahib Jan told Reuters.
"There was intense gunfire, and rocket-propelled grenades were also used."
Paramilitary troops and security forces surrounded Bannu Central Jail. Of a total 944 prisoners in the jail, 384 escaped, said another police official.
Militants apparently targeted six jail blocks in the attack, he said.
The Pakistani Taliban are closely linked with the Afghan Taliban. They move back and forth across the porous border, exchange intelligence, and provide shelter for each other in a region U.S. President Barack Obama has described as "the most dangerous place in the world".
