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Abdul Ezedi is accused of a chemical attack that left 12 people injured, including a mother and her two young daughters. The woman's injuries are thought to be "life-changing".
The Metropolitan Police said on Friday its main working hypothesis is that the 35-year-old had "gone into the water", but no body had been found
The main suspect in the Clapham attack on a woman and her two children is believed to be dead.
Chemical attack suspect Abdul Ezedi may have thrown himself off Chelsea Bridge and drowned in the Thames, police have said.
Ezedi, 35, was last seen on CCTV walking along Chelsea Bridge, near Battersea Park, around four hours after the alkali attack on January 31.