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Police believe they know the identity of the man who stabbed a teenager to death as he tried to defend his girlfriend in North London.
19 year old Marcin Bilazayski was attacked outside Finsbury Park Tube station on Saturday after getting into a row with a man on the number 254 bus.
Police seized CCTV from the bus where the man pestered Miss Betlinska before punching her as she got off.
They have also recovered some of the attacker's possessions from the scene and examined records of Oyster cards used to pay for fares on the fateful journey.