A witness who spoke to The Telegraph said: "We saw one of them fall over under the Christmas tree on Hans Crescent. The base of the tree has a white box under it and we saw blood smeared across it.
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"The guy with him who called the ambulance looked like he had been stabbed in the stomach."
Al-Araimi was found unconscious with a stab wound in his back. His friend was taken to hospital with non-life threatening injuries.
The student's killing was one of three murders that came within a 12-hour period in London on Friday. The British capital has seen a total of 135 violent deaths so far this year, with knife crime having long been an issue of concern in the city.
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