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© Eric Thayer/Getty Images/AFP"Tribute in Light" is reflected on the 9/11 Memorial
The United States is beefing up security at thousands of government buildings around the country due to "continued public calls" for terrorist attacks, Department of Homeland Security Secretary Jeh Johnson announced on Tuesday.

Johnson said the new security measures will affect more than 9,500 federal buildings as well as the 1.4 million people who visit these facilities every day. The move was described by Johnson as a"precautionary step," intended to safeguard federal buildings and visitors.

"The reasons for this action are self-evident: the continued public calls by terrorist organizations for attacks on the homeland and elsewhere, including against law enforcement and other government officials, and the acts of violence targeted at government personnel and installations in Canada and elsewhere recently," Johnson said.

"Given world events, prudence dictates a heightened vigilance in the protection of U.S. government installations and our personnel."

However, Johnson declined to detail exactly what new policies will be implemented by the Federal Protective Service, which is responsible for ensuring the safety of government facilities. The measures will differ from location to location, and will be consistently reviewed, he added.