According to railways spokesperson Muhammad Kashif, the explosion took place when the Peshawar-bound Jaffer Express was passing on the track.
He added that the derailing of at least six bogies of the train resulted in injuries to at least eight people.
The injured were later moved to a nearby hospital, while an emergency was declared in the said district's hospitals.
On Wednesday, four security personnel were martyred in a terrorist attack in Panjgur district, which originated from neighbouring Iran.
In a statement, Pakistan armed forces’ media wing Inter Services Public Relations (ISPR) said that terrorists made use of Iranian soil to target a convoy of security forces who were patrolling the border. According to the statement, Iranian authorities had been formally requested to “track down the terrorists” on their side of the border.
The fallen soldiers were identified as Lance Naik Fareed Ullah Khan, Lance Naik Abdul Razzaq, Lance Naik Muhammad Younas Khan and Sepoy Asad Ali.
In another incident, security forces killed at least four terrorists during an intelligence-based operation (IBO) in Hoshab area of the province. The ISPR had said that the terrorists were suspected in attacks on security forces and civilians, as well as planting improvised explosive devices (IEDs) on the M-8 motorway.
The ISPR said that as a result of continuous “intelligence, surveillance and reconnaissance (ISR) of the area, a location of the terrorists was identified”. On the basis of this credible intelligence, an IBO was initiated to clear the identified terrorist hideout.
Following the IBO, intelligence agencies warned of possible terrorist attacks in the twin cities of Islamabad and Rawalpindi. Police and security agencies were put on alert to ensure strict security at sensitive installations, police offices, government offices, and other potential targets for terrorists.
A threat alert was also issued after reports emerged that terrorists were present in the twin cities. These suspected terrorists were presumed to belong to a banned organisation, with possible plans to carry out sabotage activities to create chaos in the cities.