A teenager found dead in Woodford Green has been named as 18 year-old Luke Harwood from Havering.
His body was discovered by police near Broadmead Fields on Monday night.
Four men and a woman, who were arrested in connection with his death, are being interviewed by police.
A post-mortem examination is expected to take place today.
Police are particularly interested in hearing from anyone who saw a blue Fiat Punto in Courtland Close - or activity near the bridge in Chigwell Road (close to the Jet petrol station) - on Sunday or Monday.
More top news
Anti-fox hunting campaigners marched from on Downing Street to oppose controversial promise to hold a vote to repeal the Hunting Act.
Thousands of drivers were caught illegally using their mobile phones on London's roads following a major crackdown.
A motorcyclist is fighting for his life in hospital after a crash with a car in Kensington.