Butt, 27, from Barking, East London was part of a “group of British extremists intent on spreading their message of global jihad” who appeared in the program.
In the documentary, Butt (wearing all beige) is filmed praying with the black Islamic State (IS, formerly ISIS/ISIL) flag in the forefront, along with a group of other radical Muslims in the middle of London’s Regent’s Park.
A police statement released Monday said Butt was known to police and the domestic intelligence agency MI5, but was not thought to have been planning an attack.
Seven people were killed and 48 injured when three terrorists wearing fake suicide bomb vests used a rented van to mow down pedestrians on London Bridge. They then went on a knife rampage in Borough Market, stabbing victims with 12-inch blades.
Thirty-six people remain in hospital. Of those, 21 are in a critical condition.
Eleven people are in police custody in relation to the incident, Prime Minister Theresa May says.
The three attackers were shot dead by police.
The second attacker was identified as Rachid Redouane, 30. He had claimed to be both Moroccan and Libyan, according to police.
Inquiries are still ongoing to identify the name of the third attacker.
"I would urge anyone with information about these men, their movements in the days and hours before the attack and the places they frequented to come forward," Assistant Commissioner Mark Rowley said
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