Police are hunting for Kyle Clifford, 26, for the alleged murder of three people.
The three women killed in a crossbow attack in Bushey, near Watford, are the wife and daughters of BBC Racing radio commentator John Hunt.
Carol, 61, Hannah, 28, and Louise Hunt, 25, were found seriously injured at a home in Ashlyn Close at about 19:00 on Tuesday and later died at the scene.
Police are continuing their manhunt for suspect Kyle Clifford, 26, and armed officers are currently gathered at a cemetery in Enfield, north London.
They believe the attack was targeted and carried out with a crossbow, as well as possibly other weapons.
The suspect is from the Enfield area, and police have raided an address in the borough.
