Two men have been arrested on suspicion of murder following a fatal stabbing in Marylebone last Monday (November 28).

21-year-old Omar Abdullah was killed in the knife attack at Gayhurst House in Mallory Street, near Lisson Grove and Church Street.  

Omar and another man, aged 20, were found with stab injuries at the scene and treated by medics from London Ambulance Service and London's Air Ambulance.

Despite the efforts of emergency services, Omar was pronounced dead at the scene. His family has been notified and are being supported by specialist officers.

The second man was taken to hospital where his treatment is ongoing.

Later that day, a third man, aged 21, went to hospital for treatment to a hand injury he is believed to have sustained as part of the incident. His injury was not life threatening.

Police arrested two men, aged 18 and 19, at Heathrow airport earlier on Tuesday (December 6) in connection with the stabbing.

They were arrested on suspicion of murder, attempted murder and grievous bodily harm.

This Is Local London: Gayhurst House on Mallory Street, where the stabbing took place Gayhurst House on Mallory Street, where the stabbing took place (Image: Google)

Detective Chief Inspector Brian Howie, who is leading the investigation, said: “Despite the arrests made, we are still very keen to hear from anyone who has information or footage relating to this horrific incident.

“While police challenge knife crime as a priority, we can’t stop violent behaviour such as this without help from the public – there needs to be a joining of minds where police and the community work together to stamp out the carrying of knives and the violence associated with that.

“If you have information please share what you know. What you tell us, no matter how small, could be a missing piece of the puzzle we are building around Omar’s death. I urge anyone with information about this case to contact us without delay.“

Anyone with information that could assist the investigation is asked to contact police on 101 or tweet @MetCC and quote CAD 4334/28Nov.

You can also speak to the independent charity Crimestoppers anonymously on 0800 555 111.