An Islamic State fanatic emailed the Prime Minister's office threatening to "wage jihad" before being given a job guarding the Crossrail project, a court heard today.

Shamim Ahmed, 24, who once threatened to blow up a bookshop for selling the Charlie Hebdo magazine, wagged his finger at Judge John Bevan QC and warned him: "Give me 20 years, I will come out the enemy."

Ahmed had sent death threats to staff at The French Bookshop in South Kensington on January 17, 2015 with the subheading: "Protect your neck while you are still alive."

The former security guard accused the bookshop of selling the satirical magazine "against Muslims" just days after the massacre and said they would face 'major retaliation' if they continued to stock it.

He then made two threatening phone calls to the shop on 22 January, telling the owner: "I'm going to come and stab you, I'm going to come right away and blow up the shop: I'm not afraid of the police, I'm a Muslim."