Police divers from marine support unit are continuing to search the lake in Dagenham where a severed human male leg was discovered.
One of the anglers who made the gruesome discovery at White Hart Lakes says he is "still in state of shock"
He described flipping it over with a stick before he realised what it was.
Detectives are stlll looking into the possibility that the severed limb may be linked to the disappearance of Neil Buchel.
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The victim, who was also 15, was stabbed repeatedly just yards from the Capital City Academy School in Willesden.
Crossrail contractors have been hit with a fine of more than a million pounds over the death of a worker and other incidents.
Anh Nhu Nguyen, 52, claimed he lived in the North Kensington block and that his wife and son had died in the fire.