One of the accused London attackers was known to law enforcement, having appeared on a jihad TV show and twice been referred to anti-terror police, according to reports.
The alleged attacker purportedly argued with police over the unfurling of an ISIS flag while filming a jihad documentary in a park, Metro reported.
Further, two people had reported the unidentified man — one of three killed after their attack — to police over what they believed was radical behavior, including trying to radicalize kids of a neighbor, The Telegraph reported.
"I phoned the anti-terror hotline. I spoke to the gentleman. I told him about our conversation and why I think he was radicalized," The Telegraph quoted a man who identified himself as a friend of one of the terrorists.
"I did my bit, I know a lot of other people did their bit, but the authorities did not do their bit," the paper quoted the purported friend.
The friend said the attacker would listen to hate preacher Musa Jibril, and another report linked him to another, Anjem Choudary, founder of the banned terror group al-Muhajiroun.
The man, who was allegedly born in Pakistan, was reported to police by a second person, a neighbor, for trying to radicalize her children in a nearby park.
"He would go down to the park and talk to them about Islam. He also came to the houses and gave the kids money and sweets during Ramadan," the Telegraph quoted the woman.
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