Grenade-wielding Taliban fighters battled Pakistani security forces during a sophisticated midnight attack on a major prison holding hundreds of Taliban and other militants, police said on Monday.
Fighting continued into the early hours of today, and security forces said they had imposed a curfew on the city, Dera Ismail Khan, 200 miles (320 km) west of Lahore.
The Pakistani Taliban sent 100 fighters and seven suicide bombers on a mission to free some of their top leaders, said Taliban spokesman Shahidullah Shahid.
He said they had freed around 300 prisoners, a claim that could not immediately be verified. Some of the suicide bombers had blown up at the prison walls and some were in reserve, he said.
More top news
After the Indiana polls close, ITV News asked Ted Cruz supporters if they could back Donald Trump as the Republican presidential nominee.
With his massive victory in Indiana, Donald Trump can now not be stopped from becoming the Republican nominee.
Donald Trump is predicted to win the crucial Republican Indiana primary, US media have projected.