At least 10 people, including police officers and prison staff, died in a suicide attack on Thursday in a garrison town in northwest Pakistan as they headed to work, a police official told AFP.
"The van was carrying policemen and jail staff when it was hit by an explosives-laden car which was used in the attack," said Bannu police official Najeebullah, who uses only one name.
"10 people, mostly police and prison workers were killed in the attack," he said, saying the head-on collision happened around 8.55am (0255 GMT).
The van that was targeted was normally used to carry prisoners to court and then back to jail.
Bannu is a garrison town situated 250 kilometres (155 miles) southwest of the Pakistani capital Islamabad and is close to the country's tribal areas bordering Afghanistan.
Tahir Shah, a local police chief, also said the jail van had been targeted in the attack.
"When it reached Kurram Bridge another vehicle standing near exploded," he said, giving a separate account of the incident.
"The jail van fell into the river. Preliminary investigations show at least nine police personnel were killed."