A teenager threw his bike at a man before plunging two knives into his chest in a row, horrified witnesses have claimed.
The victim was stabbed to death on the street in Kingsway, Huyton, Merseyside, yesterday evening after a row thought to be inside or close to a convenience store.
Onlookers watched in terror as a teen confronted an older man, in his mid-20s, and reportedly threw a red bike at him at about 8pm.
The man was knocked to the ground before witnesses said the attacker pulled out two knives and used both to stab him repeatedly in the chest outside Gentwoods News and Convenience Store.
Witnesses claim they saw the killer dispose of at least one knife in a nearby bin and ride off on the same red bike.
Paramedics rushed the victim to hospital, but sadly he died.
A murder investigation is now underway, the Liverpool Echo reports.
House-to-house enquiries are now being carried out by police as officers called the attack "tragic".
One woman, who said her daughter saw the events unfold, told the ECHO: "She'd come out of the shop with her mate and seen the teenager on a bike and there was an older man, she said about 23, waiting over the road.
"The teen on the bike picked his bike up and pushed him to the ground with it.
"He then got on him with a knife in each hand."
She said: "He then crossed over, put one on the bin on this side and kept one and got off."
The mum said her daughter heard words had been exchanged between the two of them before the violence happened.
She added: "A couple actually got in a car and tried to chase down the lad but turned back."
This morning, a large area had been sealed off by police including part of Kingsway and the car park at the Oak Tree pub.
The incident happened on a day of serious knife crime on Merseyside with a man suffering a serious hand injury in Kirkdale and a boy, 15, stabbed next to the Childwall Fiveways, just after 3pm.
On the Huyton murder, Detective Inspector Jennie Beck of Merseyside Police said: “This is a tragic incident which has sadly led to yet another victim of knife crime on the streets of Merseyside over the last few days.
"We're determined to find whoever was responsible as soon as possible and bring them to justice. We are keen to speak to anyone who was in the area of Kingsway, Runnymede Road and Liverpool Road around 8pm and saw, heard or captured anything - be it descriptions of those involved, CCTV, dashcam or other images.
“These details could be vital to our investigation.
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"What has happened tonight has proven once again how knife crime causes devastation in our communities - this time with fatal consequences. We’ll be in the area tonight speaking to local residents, so tell us what you know and we will do the rest.”
A spokeswoman for the force added: "An investigation is now underway and a number of lines of enquiry are being pursued. CCTV, house-to-house and forensic enquiries are also being carried out, with high visibility police patrols in the local area.
"Anyone with information is asked to DM @MerPolCC on Twitter, call 101, or call Crimestoppers on 0800 555 111 quoting log 1004 of 19 April."