At least one person was killed and four others injured when a rocket-propelled grenade was fired on Quetta-bound Jaffer Express near Bakhtiarabad area of Sibbi district in Balochistan on Tuesday.
A passenger was killed and a bogie of the train damaged in the rocket attack.
Rescue efforts are underway whereas police and security forces have launched search operations to arrest the alleged perpetrators of the attack.
Meanwhile, Balochistan Chief Minister Sanaullah Khan Zehri while condemning the terror attack sought an inquiry report into the incident.
Further, the chief minister while expressing grief over the injuries inflicted to the people directed the local administration to provide best medical care to all the injured passengers.
This is not the first time that the Jaffar Express has come under attack. Most recently, in November 2015, four people were killed and another eight injured when the Rawalpindi-bound train hit a home-made bomb planted on a railway track in Mastung district.
An improvised explosive device (IED) was remotely detonated when Jaffar Express chugged into Dasht tehsil of Mastung, 30 kilometres south of Quetta.
In June 2015, the train was returning to Quetta when an explosion derailed four of its carriages near the Jacobabad district jail, leaving eight people injured.
No group immediately claimed responsibility for the attack but Baloch separatists demanding greater autonomy have been waging an insurgency for years and the province is also riven by sectarian strife and extremist violence.