The death toll from Thursday's deadly suicide bombing in Jhal Magsi rose to 21 after another victim succumbed to his injuries at Larkana Hospital on Friday, DawnNews reported.

Several people, including a police constable, had died on Thursday in the attack, which occurred at the entrance of the Dargah Pir Rakhel Shah in Fatehpur, a small town in the Jhal Magsi district of Balochistan.

A First Information Report was lodged against unidentified persons by Station House Officer at the Gandawah police station, an officer who wished to remain anonymous told Dawn on Friday. Security agencies and police are investigating the incident.

Deputy Commissioner Jhal Magsi Asadullah Kakar said on Friday that the victims of the blast, including the police constable, had been buried in different parts of the district amid tight security.

Currently, nine people are under treatment in the Larkana Hospital while 14 are admitted at Gandawah District Headquarters Hospital. A dozen patients, who had received minor injuries, were discharged from Gandawah Hospital after receiving treatment. One injured woman had been shifted to the Aga Khan Hospital in Karachi.

The deputy commissioner assured that the hospitals are taking "good care" of the injured.

The bombing was the second deadly attack on a shrine in Pakistan in 2017. In February this year, another suicide bomber had killed more than 80 people and injured more than 250 in an attack targeting the busy Lal Shahbaz Qalandar shrine in Sehwan, Sindh.

This was also the second attack on the Pir Rakhel Shah shrine. On March 19, 2005, at least 35 people were killed and many injured when a suicide bomber exploded himself at the shrine. The dead had included devotees from different sects who frequented the shrine seeking spiritual relief.