Officials at Boston's Logan International Airport are apologizing for holding a fire drill, complete with smoke and flames, on the 12th anniversary of the Sept. 11, 2001, terrorist attacks.
The two hijacked jets that were flown into the World Trade Center towers flew out of Logan.
The runway fire drill, announced on the airport's Facebook page, drew harsh condemnation on social media sites.
The Massachusetts Port Authority, the agency that runs the airport, said in a statement that: "Massport apologizes for conducting the fire training exercise and understands that it may have offended many of those touched by the events of Sept. 11. 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 airport community recognizes the day with moments of silence, a service in the chapel, and a wreath at the 9/11 memorial."
Several events were held at the airport to mark the anniversary.
"How clueless and insensitive can you be," one woman wrote on the airport's Facebook page.
The Associated Press contributed to this report.