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The proposals are intended to protect London’s finance district and its skyscrapers from a terrorist attack.

MI5 and counter-terrorism police have proposed to install the manned checkpoints, rising street bollards and crash-proof barricades.

The last time manned checkpoints were used was in 1992 following the IRA’s bombing of Baltic Exchange.

When the IRA bombed the Baltic Exchange in April 1992, three people died and 91 people were injured.