Leading by example, New York’s Mayor has taken the subway despite fears that terrorists could be planning an attack on the 10th anniversary of 9/11.
Michael Bloomberg has asked citizens to go about their usual daily routines. But, amid reports of a possible car bomb plot, he called on New Yorkers to signal any suspicious or dangerous activity.
With the city on high alert, the hunt is on for two or three suspects who could be targeting New York or Washington on Sunday.
Reflecting on the traumatic events of 2001, Hillary Clinton said al Qaeda was behind the latest specific, credible but unconfirmed threat.
“Ten years later, we have made important strides,” she said in a speech at the John Jay College of Criminal Justice in New York. “Our government is better organised. Our defences are safer than on 9/11 but we still face real threats, as we see today, and there is more work to be done.”
As the US remembers attacks that killed nearly 3,000 people, counter-terrorism efforts have been redoubled. One US official said the latest potential threat could be linked to al Qaeda’s new leader Ayman al-Zawahiri.