A man forced his way into a house in Bristol with an “explosive device” a few minutes before a blast that killed his ex-partner and himself.

Police said they were treating the death of the woman, whom they believe to be 35-year-old Jo Shaw, as homicide and named the man who died as her former partner, Ryan Kelly, 41.

They said they believed the explosion early on Sunday had been caused deliberately but stressed it was not thought to be linked to terrorism.

Avon and Somerset police said they received a call from another person inside the house at 6.17am on Sunday reporting a “domestic-related” incident.

At about 6.30am, the caller told police they thought the man had an explosive device on him.…