Birmingham Islamic State recruit Junaid Husain had tried to persuade an undercover reporter to carry out an attack on London Bridge a year before the incident on June 3.
A special report by BBC Inside Out London said one of its journalists was encouraged by the Kings Health terrorist to target London Bridge, suggesting he could do it alone or in a group and also illustrated how to attack a victim with a knife to inflict maximum damage.
The BBC reportedly said the details bore striking similarities to the attack on London Bridge. In a special report on Islamist-inspired extremism, researched over two years, the undercover journalist used Twitter to make contact with jihadist and IS recruiter Junaid Hussain.
Speaking through an encrypted messaging site, 21-year-old Hussain said he could help train the undercover reporter on how to make bombs from home.
Hussain also revealed explicit terrorist tutorials on the dark web, including step by step instructions on how to make a bomb, and a detailed description on how to create a fake suicide vest.
When Hussain was killed by a US army drone in Syria, apparently another recruiter made contact to continue the conversation. He even detailed a plot to assassinate a police officer, including how to obtain firearms and bullets.