A 36-year-old man was arrested in Amsterdam today on suspicion of the murder of student Hassan Kul Hawadleh.
The detention in the Dutch capital comes on the day Mr Hawadleh would have celebrated his 20th birthday and is the third made on the continent in connection with the death.
Mr Hawadleh, a 19-year-old from Colindale who used to attend Alperton Community School and Harrow College, was stabbed to death at High Weald Service Station in High Road, Harrow Weald, on Thursday February 19. His friend, also 19, was similarly stabbed but survived.
On March 3, Dutch police arrested a 33-year-old British man on suspicion of murder, attempted murder, violent disorder and causing grievous bodily harm and he remains in their custody.
German officers arrested an 18-year-old British man in Herbolzheim in south-western Germany on February 23 on suspicion of murder. This suspect again is being kept abroad.
All three men - the duo picked up in The Netherlands and the teenager seized in Germany - face extradition hearings.
A further five people have been arrested in total in connection with the fatal stabbing of Mr Hawadleh, who was studying construction engineering at the University of East London:
* A 20-year-old man arrested on February 22 on suspicion of murder had no further action taken against him;
* A 22-year-old man arrested on February 24 on suspicion of assisting an offender has been given police bail until April;
* A 17-year-old woman arrested on February 25 on suspicion of assisting an offender has been given police bail until later this month;
* A 30-year-old man was bailed until April.
The fourth person to be arrested - Andrew Spence, 21, of Freeland Court, Freeland Road, Ealing - is the only one to be charged so far.
He appeared at Brent Magistrates' Court on February 28 charged with murdering Mr Hawadleh, the attempted murder of the victim's friend, and violent disorder.