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17 February 2013, 12:45 | Updated: 18 February 2013, 11:21
Met police were called a block of flats in Wandsworth - where the victim was found at the bottom of a stairwell
A 16 year old boy found fatally stabbed in a stairwell of a block of flats after a party has been named by police.
Peter Hagan was pronounced dead after being discovered on the ground floor of the block in Wandsworth at 1.30am on Sunday morning.
A Metropolitan Police spokesman said: "Although we await formal identification, we are satisfied the victim was Peter Hagan."
A murder investigation has been launched and an incident room has opened at Sutton.
Nine people have been arrested in connection with the inquiry, Scotland Yard said.
Eight have been bailed pending further inquiries and the ninth currently remains in custody.
Police cordoned off a stretch of road outside Albon House in Neville Gill Close, Wandsworth, yesterday as forensics teams examined the scene.