DENVER (CBS4) – The FBI and Homeland Security are warning local police homegrown extremists might try to strike in the next couple of weeks. The agencies issued a joint bulletin late Monday afternoon.

It was normal at Denver International Airport on Tuesday. Since Sept. 11 security at airports and military bases across the country have been on heightened alert.

“Our business as usual is to always be vigilant and that’s what we’re doing right now,” Lance Clem with the Department of Public Safety said.

Even after the announcement of Osama bin Laden’s death the country hasn’t been put on a higher terrorism alert level, but some places are still taking extra precautions. Fort Carson in Colorado Springs is on heightened alert. Traffic was backed up all morning from the main gate to Academy Boulevard because of more thorough checkpoints.

The Air Force Academy is on the third highest out of four alert levels and added more checkpoints at its gates.

“We have a network of locally trained officers that recognize suspicious incidents and determine what will be done with them,” Clem said.

Since 2007 Colorado has had one of the most sophisticated networks in the country to prevent terrorism.

“I think we should feel all safer since we ever have in this country in terms of terrorism,” Clem said.

In a statement released Monday Secretary of Homeland Security Janet Napolitano says it will “continue to respond appropriately to protect the American people from an evolving threat picture both in the coming days and beyond.”

“Incidents of terrorism will continue but they may not be associated with what happened yesterday,” Clem said.

Officials are still asking for people to be vigilan and aware of any suspicious activity.