Two further men have been charged with murder in connection with a fatal stabbing on Primrose Hill, police have said.
Alexis Bidace, 25, of Fore Street, Enfield, north London, and Ernest Boateng, 25, of Keswick Drive, Enfield, were arrested on Monday and have since been charged with murder.
They will both appear at Wimbledon Magistrates' Court on Wednesday, the Metropolitan Police said.
Finbar Sullivan, 21, a filmmaking student, was stabbed to death in the early evening on Tuesday April 7 at the viewpoint in north London.
Two other men have previously been arrested in connection with his death.
Oliuwadamilola Ogunyankinnu, 27, of Southbury Road, Enfield, was charged with the student's murder on Sunday and he appeared at Stratford Magistrates' Court on Monday. He was remanded in custody.
Khalid Abdulqadir, 18, of Fellows Road, Camden, was charged with grievous bodily harm, violent disorder and possession of a knife. He appeared at Wimbledon Magistrates' Court on Tuesday and was remanded in custody.
Anyone with information should contact police, quoting reference 6448/07Apr, as the investigation continues.