A second man has been arrested by police hunting the killer of two French students.
Gabriel Ferez and Laurent Bonomo, both 23, were killed in a frenzied attack at a rented bedsit in New Cross, south-east London, on 29 June.
A police spokesman said a 33-year-old man handed himself in at a south London police station.
A 21-year-old man who was arrested in the early hours of Saturday has been released with no further action.
The badly burned bodies of Mr Bonomo, from Velaux, near Marseille and Mr Ferez, from Prouzel, near Amiens, were found with more than 240 stab wounds.
Post-mortem examinations gave the cause of death in both cases as multiple stab wounds to the head, neck and torso.
Tests also revealed Mr Bonomo suffered 80 wounds after he died.
Detectives have released an e-fit of a man seen running away from the scene in Sterling Gardens shortly after 2200 BST.
The suspect is described as white, between 30 and 40 years old and of slight or slim build, wearing a light coloured baseball cap, dark top, blue jeans and white trainers.
Making a new appeal at the scene, Det Ch Insp Mick Duthie said: "Do you know this man, who is he and where is he?
"It is possible someone who lives here, was visiting or passing through will remember something, however small, to help us solve this horrific crime."
The flat in Sterling Gardens, New Cross, which Mr Bonomo was renting, had been burgled on 23 June and a laptop was stolen.
Detectives believe their bank cards and two Sony PSP games consoles were taken on the day the pair were killed.
They have urged anyone who has been offered games consoles stolen from the flat to come forward.
Mr Ferez's parents said in a statement to those behind the killings: "Rest assured that we will not leave you in peace."
They also said his killer would "not be able to live in hiding forever".
Both men were biochemistry students and were in the third year of a masters degree at Polytech Clermont-Ferrand in central France.
They were in London because they had been chosen to take part in a research project at Imperial College and were due to return home within weeks.
(BBC)
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