Hotair writes: The Blotter had a scoop earlier today about a tip they got from Pakistani intel re: Matiur Rehman, the keeper of the "Directory of Jihad"(?) containing the names of thousands of jihadis who trained in the country's terror camps. Any connection to this plot? Quote: "U.S. law enforcement officials tell ABC News there has been great concern since last March about a "Pakistani" network that could attempt multiple international attacks."

FreedomsZone has more.

Here's the statement of Home Secretary John Reid:

Overnight the police, with the full knowledge of ministers, have carried out a major counter-terrorism operation to disrupt what we believe to be a major threat to the UK and international partners.

The police, acting with the Security Service MI5, are investigating an alleged plot to bring down a number of aircraft through mid-flight explosions, causing a considerable loss of life.

The police believe the alleged plot was a very significant one indeed.

At 2am this morning the Joint Terrorism Analysis Centre raised the UK threat state to its highest level - "CRITICAL".

This is now being publicly announced as I promised to Parliament last month.

This is a precautionary measure. We are doing everything possible to disrupt any further terrorist activity.

This will mean major disruption at all UK airports from today.

But as far as is possible we want people to go about their business as normal.

The police will provide an update on the operation later this morning and ministers will keep the public regularly informed