A house has been destroyed and two more badly damaged in a suspected gas explosion in Sheffield.
The blast at the mid-terrace property in Dundas Road, Tinsley, happened just after 09:00 BST, South Yorkshire Fire Service said.
A 150m (500ft) cordon has been put in place around the property and neighbouring homes have been evacuated.
A man, woman and two children were taken to hospital after suffering minor injuries, Yorkshire Ambulance said.
South Yorkshire Police said the man, who suffered facial burns and cuts, was believed to have been in the house destroyed in the explosion.
He was taken to the Northern General Hospital in Sheffield for treatment.
A woman and two children from a neighbouring property were taken to Rotherham District Hospital to be treated as a precaution after apparently inhaling smoke.
They have since been discharged from hospital.
'Heard a bang'
A police spokesperson said initial information indicated gas was the source of the explosion.
About 50 people who were evacuated from their homes after the explosion have been allowed back after a cordon around the area was lifted, police have confirmed.
Earlier they were taken to a refuge at nearby Hinde House School while they were unable to get into their homes.
A spokesman for South Yorkshire Fire Service said specially-trained rescue dogs had completed a search of the property and found no signs of anybody being trapped in the rubble.
Demolition of the house has been completed.
Describing the moment the explosion took place, Dundas Road resident Ehsan Ali said: "I was sleeping, I heard a bang, I looked out of my window and the house was on fire."
Neighbour Sara Knox said: "I looked out and there was all this stuff flying about. The house had no front to it."