Two more men have been arrested in connection with the murder a teenager who was attacked in a west London park.
Police believe the attack happened after the man got off a bus
Fuad Buraleh, 19, from Hayes, west London, died in hospital after an attack with what police described as a blunt instrument on Saturday.
The 23-year-old and a 63-year-old are being questioned by detectives at a west London police station.
Three men who were arrested on Monday evening have been released on police bail.
Police found Mr Buraleh when they were called to Dean Gardens, West Ealing. He was taken to hospital but died 40 minutes later from head injuries.
A Metropolitan Police spokesperson said detectives believed the victim had been out socialising in the Ealing area before he was attacked.
He is believed to have been making his way home with a friend when they got into a dispute after getting off a 207 bus on Northfield Avenue, close to where he was found.
His friend escaped unharmed.
Mr Buraleh is the fourth teenager to be killed in London this year.