A plot to bomb the London subway system has been uncovered at an Al Qaeda camp in Afghanistan: ‘Tube flood plan’ to kill thousands. (Hat tip: Smit.)

A terror plot to detonate a bomb inside a Tube tunnel beneath the Thames has been uncovered by MI5 chiefs, it was reported yesterday.

The explosion would pierce the bed of the river, leaving tens of thousands of rush- hour commuters to be drowned or trampled underfoot in the panic as people tried to flee.

Blueprints for an attack on the Underground and maps of the tunnels were reported to have been discovered at an al-Qaeda training camp in Afghanistan, a Sunday newspaper reported.