At 11:39 AEST we received reports of a gas explosion in Sydney CBD. This is what we know so far...
A man and a woman have suffered serious burns to the hands and face after the gas explosion at The Gardens cafe in Sydney's CBD.
Witnesses to the explosion report hearing a loud popping sound and seeing flashes of flame.
Sydney Fire Inspector Charles Begley told the assembled media: "In layman's terms it would be (considered) a flash burn. Witnesses experienced a tremor and just a flash of flame."
About half a dozen witnesses remain at the cafe and are speaking with authorities. WorkCover will open an investigation into the incident.