Third arrest in triple murder probe

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Keith Cowell, 52, his son Matthew, 17, and Tony Dulieu, 33, were shot dead at the Cowell family home in Bishop's Stortford, Hertfordshire, late on Tuesday. Two women, Mr Cowell's 54-year-old sister and Matthew's 23-year-old girlfriend, were badly hurt in the attack.

On Friday police arrested two men in Stevenage, Hertfordshire. And late on Sunday night a spokeswoman said detectives had arrested a third man - who is in his 20s - at Heathrow Airport.

On Saturday Mr Cowell's wife, Nicole, said her husband was "uncommonly kind" and her son "extremely popular".

Relatives of Mr Dulieu, of Billericay, Essex, have yet to comment.