Sentence examples for on heightened alert from inspiring English sources

Federer is on heightened alert — now more than ever.

The military said it was not on heightened alert.

"As for the green on blue, that's definitely put everyone on heightened alert.

For many days before such important political events the authorities are on heightened alert.

Indeed, the Bo affair put civilian officials on heightened alert for such collusive links.

Military planes and helicopters have been standing by on heightened alert, as have the secret services.

Knowing that, government officials and consumer watchdogs have been on heightened alert for possible fraud.

Because the officers believed that a gun was involved, they were on heightened alert.

Local and state law enforcement officials in Virginia are on heightened alert awaiting the execution.

"I don't see any evidence that our airports were on heightened alert," he said.

American military posts in Italy have been on heightened alert for terrorist attacks since mid-December.