Yes, this is confirmed.
Please see below.
The blast ripped through Alferno Café’, situated in the basement of the building, at 11:17 am. The café was scheduled to be inaugurated a few days later. The owner, Moazzam Paracha, and over 20 workers were present in the café when the explosion occurred.
One worker, Adnan, told the police in his statement that a few days ago the owner had brought five gas cylinders, each weighing 45kgs, four of which were placed in the basement. On Friday night, the workers had complained of foul odour in the basement, suggesting possible leakage, he added. “My brother, Asif, lit a match-stick to smoke a cigarette which could have possibly triggered the explosion.” Asif also died in the explosion.
Also, no ball bearings, no IED chemicals/materials, no claims of responsibility, etc.