Police are hunting for two men after three people were killed in a shooting in Bishop's Stortford, Hertfordshire.
A forensic search of the area is under way
The pair, said to be slim, Asian and in their late teens or early 20s, were seen in a red car near the house where the murders happened on Tuesday.
Those killed in what police have called a "targeted attack" were male and aged 17, 33 and 52. Two women, aged 23 and 54, were seriously injured.
A girl, aged three, was found unharmed in the house, in Plaw Hatch Close.
'Sense of shock'
Ch Supt Al Thomas, of Herts Police, said: "We don't underestimate the impact of these murders.
"We share the concern and sense of shock within the community.
"Early information suggests this was a targeted incident and not a random attack, we have no information to suggest this is part of a trend or escalation in gun crime in the county."
Gary Sanderson, of East of England Ambulance Services, said the three males had been pronounced dead almost immediately.
"The women were treated rapidly and were taken to hospital with serious injuries," he said.
"The little girl was carried out of the house and she was fine."
"This is one of the largest scale incidents we've ever seen involving firearms. It's totally amazing. We were shocked."
Witnesses at the scene said a father and son had been killed in the attack, but police have not yet released the identities of the victims or their relationships.
House-to-house inquires were being carried out and a forensic search of the area was under way.