A man killed his sister and seriously injured his mother in a stabbing attack before turning the knife on himself.
Police stormed the first-floor flat in a block in Leasowes Drive, Wolverhampton, around 9.45am on Wednesday (8 March).
The sister, aged 33, died at the scene and the 36-year-old male suspect was pronounced dead shortly afterwards.
Officers said the stabbing was a domestic-related incident. Stun grenades were used as officers stormed the flat in a bid to distract and detain the knifeman, West Midlands Police said.
They said another woman, believed to be in her 50s, had been taken to hospital with critical stomach wounds while a police officer was treated for minor injuries.
WMP notified the Independent Police Complaints Commission (IPCC) of the incident this morning, and IPCC investigators were deployed to the scene and to the police post-incident procedures.
IPCC Commissioner Derrick Campbell said: "These were traumatic events in Wolverhampton this morning and my sympathies go out to all those affected. Our investigators are now busy conducting initial enquiries to gather a full picture of the police involvement in what unfolded. It is proper that in such a serious incident as this there is independent scrutiny of what took place."
Superintendent Keith Fraser said that the attacker chased the officers, causing one to receive a leg injury and the other an arm injury. Armed officers then arrived and used Tasers on the man – which had little effect.
Supt Fraser said: "Officers then threw stun grenades at the man. The knife man has then turned the knife on himself and has died at the scene."