Authorities in greater Portland say they are vigilant, but have not ratcheted up security following the death of Osama bin Laden.

The Department of Homeland Security has not issued any National Terrorism Advisory System alerts, though some observers have speculated bin Laden’s followers may try to avenge his death with new terrorist strikes.

Noel March, The U.S. Marshal for Maine in charge of protecting federal buildings and judges, said his staff is vigilant, but not beyond how they are regularly.

“We are continuing to maintain a posture that is alert but not alarmed, as always,” March said. “We’re maintaining our usual level of protection and awareness.”

Steve McCausland, spokesman for the Maine State Police, said he is unaware of any new security measures in the wake of bin Laden’s death.

“We’re aware of it and our intelligence division is monitoring information coming from other law enforcement sources around the country but I don’t have any specifics,” McCausland said.

Portland Jetport Director Paul Bradbury said his staff have not made any changes to airport security, though he said it’s possible the TSA may have quietly stepped up their efforts.

Bradbury added that security has become much tighter since the terrorist attacks of 2001. These days, he said, there are more air marshals and many pilots carry weapons. In addition, all checked and carry-on baggage is screened for explosives.

“Aviation is a different business than it was prior to 9/11,” he said. “The changes over the last 10 years have made things safer.”