A DAD was knifed to death in front of his teenage son after rowing with a neighbour over his "noisy" motorbikes, horrified locals say.
Armed cops swooped on the quiet town of Thorpe St Andrew near Norwich last night after a brawl erupted.
Dad-of-three Dean Allsop, 41, was stabbed to death while three other people - including his partner Louise - were taken to hospital with knife wounds.
Norfolk Police confirmed two people have been arrested in connection with the horror and will be quizzed by cops.
Locals say the violence broke out when Dean was confronted by a neighbour over the noise of his bikes.
Pal Aaron Barkshire, 29, who lives nearby, said: “Dean and his son who was aged 17 or 18 both had road legal motorbikes and were going out for a ride.
“This neighbour went outside because he didn’t like the noise of the bikes. There was a bit of a verbal argument and it just turned nasty.
“Dean and his son were with the bike and he didn’t like the noise, so he came out giving it a lot. Dean rang the police and it got a bit verbal between them.
“It is awful that something so trivial caused this. It is just phenomenal.”
The mechanic said he locked himself in the garage after hearing a "knife was involved" in the altercation.
He added: "I decided to go back to my house and as I went out, Dean’s son was shouting to me to call the police because his Dad had been stabbed multiple times.
“I saw this guy standing there with a knife. It was a big knife. I was fearing for my life because this guy had seen me go into the garage and there was a massive knife. I thought I was next in the firing line
“I saw Dean covered in blood, but he was alive at this point. We heard a lot of commotion and I think it carried on thereafter. It was all in a blue like slow motion.”
Paying tribute to Dean, the pal said he had a "heart of gold".
One of the women who is in hospital after being stabbed is Mr Allsop’s partner Louise Newell who is believed to be aged 40.
Friends at the scene said she and another woman neighbour were both stabbed when they went out to see what was happening.
The family were said to have moved to the area around ten-years-ago from Essex.
Police said they were called to the "disturbance involving a large number of people" at around 7.35pm.
Around eight police cars, ambulances, rapid response vehicles and the air ambulance were scrambled.
The scene has now been cordoned off while police conduct their enquiries.
Superintendent Tracey Little said: "A murder investigation has been launched and we are in the early stages of our enquiries to establish the circumstances surrounding the incident.
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"We would like to hear from anyone who may have witnessed the incident or has information concerning it."
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Thorpe St Andrew is a small town with around 13,000 residents and sits beside the River Yare on the edge of the Norfolk Broads.
Anyone with information is asked to contact Norfolk Police on 101.