The one who was holding the rucksack when it denonated. The other tossed a rucksack into a carriage and took off.
Uncomfirmed reports of arrests being made in hospital.
Idiot couldn't even kill himself in a suicide bomb attack. Now he will wish he was dead.
If they have proof of the perpetrator in the hospital, they need to stop all medical procedures, take them outside in front of the crowd and put one bullet in the back of the head.