QUETTA: At least one passenger was killed and another two injured when armed militants opened fire at a passenger bus in Kalat district of Balochistan late on Saturday night.

Levies sources told Dawn.com four armed militants on two motorcycles opened fire at a passenger bus near Mangochar area of Kalat district.

They said one passenger was killed on the spot and two were critically injured as result of firing. The injured were soon rushed to Kalat for medical treatment.

Levies said the condition of injured passengers was critical.

The enraged passengers and transporters blocked national highway linking Quetta with Karachi in protest over the firing incident.

Long queues of vehicles could be witnessed on both sides of the road, Levies said. The protesters chanted full-throated slogans against the assailants and administration for its failure to provide protection to people.

The attackers drove off the spot after the strike. Levies said the situation was tense as result of the incident.

More Levies personnel were called in the area to maintain the order.