U.S. to tighten security at federal buildings

WASHINGTON - The Homeland Security Department says security will be increased at federal government buildings in Washington and other cities.

Secretary Jeh Johnson announced the move Tuesday, one week after a gunman in Ottawa shot a soldier and stormed Canada's seat of government.

"The precise actions we are taking and the precise locations at which we will enhance security is law-enforcement sensitive, will vary and shift from location to location, and will be continually re-evaluated," Johnson said in a statement. "Given world events, prudence dictates a heightened vigilance in the protection of U.S. government installations and our personnel. "

A federal official tells CBS News the increase in security at is not the result of any specific threat

There are currently 9,500 federal buildings in the United States owned or leased by the government, through which 1.4 million workers or visitors pass through daily, Johnson explained.

Johnson says the increased security is in response to "continued public calls by terrorist organizations for attacks on the homeland and elsewhere."

Johnson would not identify the buildings that will receive enhanced security or disclose the specific security measures to be taken by the Federal Protective Service. The agency protects nearly 10,000 federal facilities.