The security level in the UK has gone up to critical, the highest. This would be like the DHS color coded Christmas tree going up to Red or whatever the highest is.

There are unconfirmed reports that Liverpool Airport has been closed due to the increased threat.

The (terrorist) individual who was badly burned has died at the hospital. (edit: conflicting reports)

Here in the states, CBS News has announced there will be higher levels of security at US Airports. What I have heard is airports are now going to "Enhanced Orange" - increased patrols, increased vehicle checks, more K-9 units, and more behavioral analysis.