Anton Hyman's body was found on Mother's Day

Up to 200 people attended the ceremony for Anton Hyman, 17, from Acton, west London, who was spotted in the river in Greenford, west London, on 21 March.

A post-mortem examination showed he had been stabbed and shot in the back.

Police said six people arrested in Hanwell, west London, on Monday in connection with the incident, have been released on police bail.

The service was held by Anton's family at Friary Park Estate Community Centre, in Acton.

This is not the sort of news I expected to hear - especially on Mother's Day Vanessa Hyman

Mr Hyman was last seen getting into a taxi in Ealing Broadway at about 2000 BST on 20 March.

His body was found about 15 hours later by a passer-by - on Mother's Day.

He had been repeatedly stabbed in the neck, beaten around the head with a blunt instrument and then shot.

His mother, Vanessa Hyman, told BBC London: "Too many young people are dying.

"Mothers are being stripped of their sons. This is not the sort of news I expected to hear - especially on Mother's Day."

Police say they still have no motive for the attack which they have described as "brutal and protracted".