Meanwhile, another victim has been named as Australian Kirsty Boden, who her family said ran towards London Bridge in an effort to help people.
Seven people were killed and 48 injured in the attack which began at 21:58 BST on Saturday night.
NHS England said 36 people remained in hospital, with 18 in a critical condition.
Ms Boden's family described her in a statement as an "outgoing, kind and generous person".
"We are so proud of Kirsty's brave actions which demonstrate how selfless, caring and heroic she was, not only on that night, but throughout all of her life," they added.
Canadian national Chrissy Archibald, 30, has been named as having been killed in the attack, and the family of 32-year-old James McMullan, from Hackney, east London, say they believe he also died.
Butt and his two accomplices drove a hired van into pedestrians on London Bridge before stabbing people in the area around Borough Market.
All three men were shot dead by police within eight minutes of receiving a 999 call.
Butt had featured in a Channel 4 documentary The Jihadis Next Door, broadcast last year.
Radouane was a chef who also used the name Rachid Elkhdar and police said he claimed to be Moroccan-Libyan.
All 12 people arrested on Sunday after the London attack have now been released without charge.
On Tuesday, counter-terror officers were searching a property in Ilford, east London, after entering the address at around 01:30 BST. No arrests had been made, police said.
More about: #Londonattack
