In Britain's third Islamist attack in as many months, three men on Saturday rammed a van into pedestrians on London Bridge before running into the Borough Market area, where they slit throats and stabbed people indiscriminately.
"Formal identification has not yet taken place, however Thomas' next of kin have been informed of this development", the police said.
British counterterrorism investigators searched homes and detained more people yesterday in the London attack investigation as an intense political firestorm developed over Prime Minister Theresa May's role in reducing police ranks.
The body was recovered near Limehouse, downstream from London Bridge, at around 7.45pm on Tuesday by specialist officers from the marine police unit.
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Ms Delcros is said to have been seriously injured. He was known to police and MI5, the United Kingdom's domestic counter-intelligence agency, Assistant Commissioner Mark Rowley said.
According to Italy's Corriere della Sera newspaper Zaghba had been stopped at Bologna airport in 2016 when trying to fly to Syria via Turkey, and Italian authorities had identified him as as a potential "foreign fighter" and tipped off Britain about his movements. Witness accounts suggested Thomas might have been thrown into the river, police said.
The attackers killed several people and wounded almost 50 people before being shot dead.
Two men, aged 34 and 37, were taken into custody at separate addresses in Newham, east London, while a third, aged 33, was arrested in Waltham Forest.
The second attacker was named as 30-year-old Rachid Redouane, who police said claimed to be Moroccan and Libyan. Twelve others, who were arrested on Sunday, were released without charge the following day. Italian officials said suspicions about him had been shared with British authorities. He and Butt lived in Barking in east London. "I want to say sorry to the families that lost their loved ones".