CCTV footage showing a man walking back to the bank with a container after he visited a service station. Fire crews arrived at the bank within 90 seconds of the explosion. The man believed responsible for the horrific attack, understood to be 21, was under police guard at The Alfred hospital on Friday night, where he was being treated for his injuries. Late on Friday, CCTV footage emerged of a man picking up a large plastic container outside local cafe Asmara, and walking towards a nearby Caltex service station. The footage showed the man again at 11:22am, walking back past the camera in the direction of the bank. A short time later, an explosion was heard.

A victim of the Springvale fire nurses her injured son. Credit:Facebook/Sophie Mach After the fire, the badly-burnt man fled into a laneway at the back of the bank, where he stood with his head in his hands as he was intercepted by paramedics and police, Greater Dandenong Acting Inspector Jacqui Poida said. She said it was too early to say what the man's motive was, and urged anyone who witnessed the attack to call police or Crime Stoppers. The Springvale Commonwealth Bank branch after the fire in November. Credit:Michael Dodge The youngest of the man's victims was a toddler. The oldest were in their 70s and 80s.

Ambulance Victoria group manager Andy Roughton said six people were in a critical state. Asked whether any could succumb to their injuries, he said: "I hope that's not the case but there's a chance." A victim is treated by paramedics at the bank. By Friday evening, three of the six critically-injured people had improved enough to be listed as stable. One other was listed as serious, but stable. Paramedics treated 27 people at the scene for burns and smoke inhalation. Commonwealth Bank staff were among the injured. The ATM outside the bank. Credit:Michael Dodge

Paul Carrigg​, operations manager of Dandenong CFA, said the man had used a liquid accelerant to spark the explosion. "There would have been a lot of flames to start with, and a lot of smoke," he said. Smoke poured out of the building as witnesses raced to the scene. One witnesses, Ernie Gonzalez, told Fairfax Media he had heard another witness say a man had set himself on fire at the entrance of the bank before running inside and squirting gasoline on the carpet. "He's setting the carpet on fire as he's running towards the back of the bank," Mr Gonzalez said, adding that the bank tellers had been forced to run through the flames to escape the building.

"I could see flames in the entrance and I could see people running out covered in charcoal - they were black," he said. He said after he saw people run from the bank, he went to a lane behind it, where he saw a man in his 20s crouched behind some boxes. "He was wearing tracksuit pants that were burnt, they looked like shorts," he said. "His skin was falling off his legs." PHOTO BY ?Ernesto Gonzalez SPRINGVALE COMMONWEALTH BANK FIRE...AGE NEWS 18/11/2016 ?the moment the man was arrested. Hard to see but the skin on his legs was hanging off from the burns.

Mr Gonzalez said he saw police surround the man before he was arrested and taken to hospital by paramedics. Anthony Banh, the manager of Love Central Jewellery across the road from the bank, said he went outside immediately after people came running and screaming past his the shop. "A guy had severe burns on his face and arms and everything. There was another man crouched on the ground with severe burns." Mr Bahn said people came running to help the injured and to use fire hydrants to put out the flames. "People were quite brave," he said.

Commonwealth Bank chief executive Ian Narev​ issued a statement saying management was "deeply concerned" about the Springvale attack. "Our absolute priority is the welfare of our customers and staff who were in the branch at the time," he said. Loading "We have teams assisting our people and a customer liaison officer available for affected customers, and will keep them engaged as long as is necessary. We thank the emergency authorities for their quick response and actions." The Arson Squad is investigating.