Yasir did not see the man who shot his father and said all he could "remember is a big gun".
As the car drove away, Yasir called an ambulance. He had no idea of the carnage just metres away from him inside the mosque.
Yasir wanted to stay by his father's bedside at the hospital, but was given another grim task: identifying the bodies of other victims at the morgue.
One of the nine people he identified was his best friend, Nahim Rashid.