ISLAMABAD -- A suicide car bomber has targeted a bus full of Pakistani police, killing at least 11 people and injuring some 50 others.
Many of the injured are said to be in critical condition.
The attack occurred near the southern port city of Karachi.
There has been no immediate claim of responsibility.
The latest violence comes amid peace talks between government and Taliban representatives aimed at trying to end Pakistan's violent insurgency.
Both sides are supposed to refrain from major attacks during the talks.
The February 13 bombing follows an attack one day earlier on the home of a slain policemen in the northern city of Peshawar that killed nine members of a pro-government militia, while a grenade attack on a cinema on February 11, also in Peshawar, killed 13.
Based on reporting by dpa, Reuters, AFP, AP, and RFE/RL's Radio Mashaal