Two men have been arrested on suspicion of murder after fatal shootings in Hertfordshire which saw three men killed and two women injured.
Keith Cowell and his son Matthew died alongside Tony Dulieu
Keith Cowell, 52, and his son Matthew, 17, died alongside 33-year-old Tony Dulieu, of Billericay, in the shooting in Bishop's Stortford on Tuesday night.
Police said two men had been arrested on Thursday night in Stevenage, Herts, and would be questioned on Friday.
A girl aged three was found unharmed in the house in Plaw Hatch Close.
The killers ran out of bullets during the attack and used a knife to stab the injured women, the BBC has learned.
Mr Cowell's wife Nicole, 46, had left for work at Stansted Airport minutes before the gunmen arrived.
A woman, aged 54, believed to be Mr Cowell's sister, and a woman aged 23, believed to be Matthew's girlfriend Claire, were seriously injured. Their condition remains serious but stable.
The three-year-old girl, who is called Angel and thought to be Claire's daughter, is now being cared for by child protection officers.
Mrs Cowell's brother Roger Spellane, 55, a kitchen fitter from Wood Green, London, said his sister had to formally identify her husband and son at the hospital morgue where their bodies were taken.
He said the older woman who was shot and injured in the incident had been Mr Cowell's sister. He said the younger woman was Matthew's girlfriend Claire.
Post-mortem examinations carried out on Mr Cowell and his son Matthew confirmed they died from gun shots.
Tests on the body of Mr Dulieu will be carried out on Friday.