Police were not linking the explosion to terrorism, but said they were treating the child's death as "suspicious."

Superintendent Neil Evans said detectives were looking into reports of a domestic disturbance in the area the night before the explosion.

Fire service spokesman Dean Nankivell said firefighters were looking at a variety of possible causes for the blast, but "gas is definitely a strong contender."

The National Grid utilities company said residents had complained of a smell of gas before the blast.

The explosion left a pile of rubble where the row house had stood in the town of Oldham, 160 miles (260 kilometers) northwest of London, and damaged two other houses beyond repair.

Greater Manchester Police said the injured man was taken to a nearby hospital with serious burns. He was in serious but stable condition Tuesday.

Firefighters searched the rubble amid fears more people could be trapped, but found no one.

The National Grid said five houses were damaged and 100 homes evacuated after the blast.