Fourth arrest in triple death probe

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Hertfordshire Police said a man in his 30s was arrested in London. On Sunday a man in his 20s was detained at Heathrow airport. A spokeswoman said both are being questioned.

Two men arrested in Stevenage, Herts, on Friday have been released on police bail until a later date pending further inquiry, said officers.

Keith Cowell, 52, and his son Matthew, 17, were shot dead at their home in Bishop's Stortford, Herts, six days ago - along with Tony Dulieu, 33, of Billericay, Essex.

A 23-year-old woman and a 54-year-old women were badly hurt in the attack.

Police said a three-year-old girl in the house at the time of the shooting was unharmed.