London (AP) - Britain's busy Heathrow Airport has become a traveler's nightmare amid a security crackdown prompted by announcement of a foiled terrorist plot.
British officials say police have arrested a number of people in a plot to blow-up U.S.-bound flights with explosives smuggled aboard in carry-on luggage.
Britain has raised its national threat level to "critical." that's the highest.
In the U.S., Homeland Security Chief Michael Chertoff is raising the alert level for flights coming into the U.S. from Britain to the highest level, code red. And he's boosting the alert level for all other flights to orange, the next highest.
President Bush has been briefed on the situation by Britain's Prime Minister Tony Blair.