ISLAMABAD, June 26 (Xinhua) -- Four people were killed after unidentified armed assailants opened fire on a private ambulance in Pakistan's northwestern Khyber Pakhtunkhwa province on Friday, police sources said.
The attack occurred in Bannu district, where gunmen targeted the ambulance, killing all four occupants, the sources told Xinhua.
A heavy police contingent rushed to the scene after receiving information about the incident and shifted the bodies to a nearby hospital.
Police cordoned off the area and collected forensic evidence from the crime scene.
Initial investigations suggest that the attack may have been an act of terrorism, although authorities said all possible angles are being examined.
A search operation has been launched to trace and arrest the attackers, while an investigation into the incident is underway.
No group has claimed responsibility for the attack. ■
