According to Station House Officer of Quaidabad police station, the explosive material was planted on a motorcycle, detonated as a bus of the Sindh Police’s Special Security Unit passed by.
Tehreek-i-Taliban Pakistan (TTP) spokesman Muhammad Khorasani, speaking to a private TV channel from an undisclosed location, claimed responsibility of the attack.
DIG-East Munir Sheikh told media persons that the bomb was remotely detonated. BDS sources said that five kilograms of explosive material was used in the blast. Around 50 police personnel were traveling in the vehicle at the time of the blast.
Rescue and emergency teams were dispatched to the blast site, while the victims were shifted to Jinnah Postgraduate Medical Centre for treatment.
Two policemen later succumbed to their wounds while receiving treatment.
In-charge of the JPMC Accidents and Emergency Department, Dr Seemi Jamali, confirmed that 12 injured persons were brought in the hospital for treatment. She added that the condition of one injured was critical.
Dr Jamali further said that most of the victims had suffered ball-bearing and shrapnel injuries.
Security personnel also reached the spot and cordoned off the area as a probe into the incident went underway. The bomb disposal squad was also called in to collect evidence.
Fear and panic gripped the area following the blast which was heard far and wide. The blast also caused damage to other vehicles in its vicinity.