An agent for Islamic State reportedly tried to persuade an undercover reporter to carry out a terror attack on London Bridge in 2016.
A report for the BBC's Inside Out in London claimed one of its journalists has been encouraged by the individual to conduct an attack on the landmark, either alone or as part of a group.
The agent is believed to have provided step-by-step instructions on how to make a bomb and a fake suicide vest, as well as information as to where to stab a knife to cause the most injury, amongst other terrorist tutorials.
The BBC claims the encouragement and instructions were strikingly similar to the attack which took place in the British capital on June 3.
The undercover reporter, who has not been named, said Isis had been putting feelers out on Twitter and Facebook for British Muslims to target specific landmarks.
Contact with the terrorist was established, with the authorities fully aware of its true nature.
In June three attackers launched an attack on London Bridge, mounting the pavement of the bridge itself before stabbing bystanders in the adjacent Borough Market.
Rachid Redouane, Youssef Zaghbam and Khuram Butt were shot and killed by security services after the attack, which killed eight and injured dozens.