The two people arrested on suspicion of the murder of Jamil Palmer have been bailed.
An 18-year-old man and 16-year-old boy were arrested on Tuesday, May 6, by detectives investigating the fatal stabbing of Mr Palmer in Feltham on Monday.
Both are due to return to a west London police station on a date in mid-May pending further enquiries.
Mr Palmer, 18, of Belgrade Road, attended Hampton Junior School, Teddington School and Richmond College, where he studied politics until 2013.
Police continue to appeal for information surrounding the murder.
Call the incident room on 020 8785 8099 or call Crimestoppers anonymously on 0800 555 111 with information.