Sentence examples for is on alert from inspiring English sources

This time, although the 101st Airborne is on alert, it has not received orders to deploy.

Inside Frank, from Cerebellum Hall to the Lower East Backside, everybody is on alert.

Europe in general is on alert for possible terrorist attacks during the holiday season.

Lyons, where only small incidents have been reported, is on alert.

Once activated, the immune system is on alert to target cancers as they develop throughout the body.

Ankang is on alert, with the local authorities posting warning notices online, on roadside treetrunks and on primary school walls.

"We are going to be on alert".

South Korea and the U.S. are on alert.

Some 7,000 police will be on alert.

Even the navy was on alert.

You've got to be on alert.