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Usman Khan, the Pakistani Muslim terrorist who went on a stabbing spree near London Bridge, had been sent to jail in 2012 for his role in a massive terror plot, before being released in 2018. Another of his comrades, who was also released, had plotted his own terror attack.

A terrorist jailed with London Bridge knifeman Usman Khan over a plot to kill Boris Johnson and attack London landmarks left prison only to begin planning a Lee Rigby-style murder.

Mohibur Rahman, 35, was one of nine terrorists, also including Khan, who were handed long sentences in 2012 for a plan to blow up famous sights in the capital including the London Eye and the London Stock Exchange.

Rahman was released in 2015 but while serving part of his sentence at Belmarsh top security prison in South-East London he became friends with two men from the West Midlands, Khobaib Hussain and Naweed Ali.

The trio formed a group that they called ‘The Three Musketeers’ and used that name to communicate with each other on encrypted social media apps.

Inspired by the murder of Fusilier Lee Rigby near the Royal Artillery Barracks in Woolwich, South East London, in May 2013, they plotted to launch attacks against military targets across the UK armed with knives, meat cleavers and even pipe bombs. A fourth man, Tahir Aziz, 40, joined their plot later.

How long until the other members of the terror cell carry out their own attacks?