A bomb explosion near a railway station in the city of Quetta, located in the Pakistani province of Balochistan, left at least 21 people dead and 30 others injured, the local media reported on Saturday.
The explosion occurred at 9:00 am (04:00 GMT) when a Jaffer Express train was scheduled to depart from Quetta to Peshawar, railway officials were cited as saying.
The incident appears to be a suicide blast, but the investigation is still ongoing, local police officer Muhammad Baloch was cited as saying by the broadcaster.
The death toll from the explosion may reportedly increase, as several of the injured are in critical condition.
Police and rescue teams arrived at the scene of the incident, while emergency measures were initiated at Quetta's civil hospital, the broadcaster reported.