The agency that owns and operates Logan International Airport in Boston has issued an apology for holding fire department training exercises at the airport on Sept. 11.

The exercises involved smoke on the airfield at Logan, a potentially worrisome sight on the 12th anniversary of the terror attacks. Two of the jets hijacked on Sept. 11, 2001, departed from Logan Airport that morning.

In a statement posted to Logan’s Facebook page on Wednesday afternoon, the Massachusetts Port Authority apologized and noted that the agency “understands that it may have offended many of those touched by the events of Sept. 11.”

Airport officials had posted to Twitter and Facebook at around 9:30 a.m. warning that the training would produce smoke.

“Safety and security is our top priority and constant vigilance and readiness is critical, but the exercise should not have taken place on the anniversary of 9/11,” the agency said in the statement.