NYC On Heightened Alert

New York put on heightened alert after London transit blasts

New York City is on heightened alert this morning after the deadly series of explosions in London. Authorities have stepped up security around subways, buses and transit stations.

A law enforcement source tells The Associated Press that Police Commissioner Raymond Kelly is also meeting with top brass and has put additional security measures in place. Governor George Pataki says he's spoken with Homeland Security Secretary Michael Chertoff and has ordered state troopers to use mass transit. He has also signed an executive order giving policing authority to state police from New Jersey and Connecticut while riding New York trains.

Commuters admit to some nervousness but haven't let news of the explosions alter their travel routes. More than four million people use New York's subways each day.