The phrase "a high level of alert" is correct and usable in written English.
It can be used in contexts where one is describing a state of heightened awareness or vigilance, often in relation to safety or security.
Example: "The security team maintained a high level of alert during the event to ensure the safety of all attendees."
Alternatives: "a heightened state of awareness" or "an elevated level of vigilance."
"We're always at a high level of alert," said Danny Seaman, a government spokesman.
This is quite a dynamic region, which is why we certainly need to keep a high level of alert and open eyes".
As the nation returned to a high level of alert, state, local and federal officials stepped up security today at sensitive sites.
"You can't stay at such a high level of alert indefinitely without creating huge financial and manpower problems," a law enforcement official said.
A10 NATIONAL A23-26 Many States Slow to Heed A Federal Call to Arms State, local and federal officials stepped up security at sensitive sites as the nation returned to a high level of alert.
Attorney General John Ashcroft's announcement yesterday that the nation was going to a high level of alert was beamed into American offices and living rooms by all three networks, interrupting the familiar patter of such early afternoon programs as "Family Feud" and "Passions".
Since March, the colonel said, military bases overseas have been operating at a higher level of alert than installations in the United States.
"We really have continued to maintain a higher level of alert," said Beverly Lennen, the police chief in Santa Fe, N.M. "We update our officers weekly, and any critical information is related to them immediately".
"The government today told the American people that they should be on a higher level of alert right on the eve of Sept. 11," said Sandy Genelius, a spokesperson for CBS News. "That was newsworthy, and so we broke into normal programming to do a special report".
Senior administration officials said that Mr. Ridge's comments today -- which came as he and other officials continued to express their delight over the weekend capture of a senior Qaeda operative, Khalid Shaikh Mohammed -- were an effort to lay the public groundwork for a decision soon to put the nation on a higher level of alert and take other actions to prepare for a domestic terrorist strike.
"Croatia's president met the army chief of staff and required a higher level of alert and the army and to be ready, if need be, to protect the national borders from the illegal migration," Hina reported.
