ISLAMABAD, July 5 (Xinhua) -- At least six people were killed and 18 others injured when a passenger bus collided with a trailer in Pakistan's eastern Punjab province on Saturday morning, local officials said.

The accident took place around 7:00 a.m. local time (0200 GMT) in Muzaffargarh district, when a Muzaffargarh-bound bus hit the trailer, police sources from the district told Xinhua.

According to rescue officials, the deceased included two men, two women, and two children.

The injured, including eight seriously wounded people, were shifted to the neighboring Multan district for advanced medical care, while 10 were admitted to the District Headquarters Hospital in Muzaffargarh, the sources added.

Rescue 1122 teams arrived promptly at the scene and carried out relief operations.

The sources said an investigation is underway to determine the cause of the collision. ■