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Detectives are working on the theory that Clapham chemical attack threw himself off Chelsea Bridge and drowned in the Thames.
Afghan refugee Abdul Ezedi has not been seen since the night he allegedly hurled a toxic substance at a mother with her two children.
The CCTV of the last known sighting shows him close to the bridge at just before 11.30pm last Wednesday.
A source told the Sun: “The investigation team believe Ezedi died soon after the last sighting of him on camera on the north side of the river.”
The 35-year-old crossed over the bridge twice, first walking south and entering Battersea Park at 11.25pm.
Two minutes later he was seen again on camera heading back to the north side of Chelsea Bridge.
The theory is that he may have thrown himself into the fast flowing river where bodies are difficult to locate.
Ezedi suffered a serious injury to the right side of the face during the attack at 7.25pm in Lessar Road last Wednesday.
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He arranged to meet the 31-year-old woman after a relationship between the pair ended.
He had driven to London from his Newcastle home in a white Hyundai car on the same day. He is suspected of throwing an alkaline substance in her face, causing injuries that may mean she loses the sight in one eye.
Bystanders who jumped in to help the family were also injured.
Ezedi fled on foot and took the Tube from Clapham South to King’s Cross, North London after ditching his car which he had ploughed into a parked vehicle near the crime scene.
He then took the Tube at King’s Cross station, after buying a bottle of water at a nearby Tesco, and got off at Tower Hill.
Counter terror officers, drafted in because of their expertise in tracing suspects, trawled through CCTV and picked up his trail.
Images showed him walking west by Southwark Bridge and on to Blackfriars where he was seen outside a Unilever building at 10.04pm.
He carried on walking west, his route hugging the Thames and he passed near New Scotland Yard before crossing over Westminster Bridge.
They then found footage 59 minutes later from CCTV on the north side of Vauxhall Bridge.
From there he continued walking west to Chelsea Bridge where he is believed to have plunged into the cold, todal waters.
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Commander Savell had said at a briefing on Wednesday that the Thames jump theory was an active line of inquiry.
He said: “It is a possibility he has gone into the Thames.
“Sadly, we recover people from the Thames and it takes a while for it to happen.
“It is a very fast-flowing body of water. Nobody has seen anyone going into the Thames and no bodies have been recovered.”
He added that police were considering whether Ezedi ended up in the river “either deliberately or accidentally.”
The mother remains in a “critical but stable” condition in hospital.
Her young daughters were also injured in the attack and are making progress.
Witnessed described how her three-year-old had been thrown to the ground “like a ragdoll”.
Both her and her eight year-old sister are said to be recovering well.
Armed police have raided address in Newcastle, including the pizza restaurant where he had worked.
A 22-year-old man was arrested in London on suspicion of offending an offender and has been bailed.
More than 100 officers have been involved in the manhunt.