WASHINGTON (AP) — The federal government is escalating security around the country in preparation for the 10th anniversary of the 9/11 terrorist attacks and conducting confidential briefings with state and local law enforcement organizations.

But officials say there is no specific indication that a terror plot against the U.S. is under way.

Americans can expect more security at airports, mass transit stations, U.S. borders, government buildings and major athletic events over the next month, said an intelligence official who spoke anonymously to discuss sensitive security matters.

The FBI and Homeland Security Department have been briefing state and local law enforcement agencies on potential terror threats to the U.S. and ways to increase security in their communities. The briefings are routine, and security has been enhanced for other major events in the past decade. But the significance of the 10-year anniversary of the worst terror attacks on U.S. soil is not lost on security officials, who fear that someone with terrorist sympathies might see 9/11 as an opportunity to make a statement.

“It’s been a long buildup as we approach the anniversary of 9/11,” said Sean Duggan, assistant chief at the Scottsdale, Ariz., Police Department. Duggan said his department gets daily updates from the FBI and Homeland Security Department.