The other incident according to police sources also occurred in the Chiltan Express between Sibi and Mashkak, when the train was heading to Lahore from Quetta. One passenger was killed and five women injured in the blast.
The injured were admitted to the nearest hospitals for treatment.
BR MULTAN CORRESPONDENT ADDS: At least one protestor was killed and five others injured when law enforcing agencies opened fire at a protest rally in Sui on Friday against the army operation in Dera Bugti and adjacent areas, which claimed the lives of 50 Baloch and three servicemen.
"More than 2,000 locals organised a rally on Friday in Sui to mourn the death of innocent people who were killed in Thursday's operation and to condemn the army operation, but law enforcing agencies opened fire at the participants. Resultantly, one person died on the spot and another five injured," a spokesman of Jamhoori Watan Party Rauf Khan Sasoli told this correspondent on phone.
He said that law-enforcing agencies are not allowing them to take the body of dead person nor let the injured to go to hospital.
Sasoli said that protest rallies were organised in almost all towns and cities of Balochistan on Friday and seven-day mourning would continue till Thursday.
Baloch leaders Akhtar Khan Mengal, Tahir Bizenjo, Hamayun Khan Marri and Rauf Khan Sasoli have appealed to the politicians, intellectuals, lawyers, human rights activists of Punjab to show their reaction on this unjust army operation forthwith otherwise a wave of hatred against Punjab could be developed in the area which might be harmful to country's integrity and solidarity.
Nawab Muhammad Akbar Khan Bugti, Chief of Jamhoori Watan Party alleged, "Our 50 people were killed and more than 150 injured when the army hit our thickly populated area suddenly on Thursday and law enforcing agencies increased its pressure toward my residence," he said adding "we are not aggressors but we are defending our children and ourselves. Frontier Corps used artillery and shot fires indiscriminately and number of bombs fell near my residence".