PHOENIX (AP) - Various cities around Arizona are marking the 15th anniversary of the Sept. 11 terrorist attack.
Tempe has put up its annual "Healing Field" display of nearly 3,000 American flags - one for every victim killed in the 2001 attacks.
In Scottsdale, the city's performing arts center is currently showing a 9/11 exhibit that includes memorabilia from retired New York firefighters and police officers.
Tucson is holding a memorial stair climb Sunday morning as a tribute to firefighters who died after entering the World Trade Center's Twin Towers.
Gov. Doug Ducey has ordered flags on all state office buildings be lowered to half-staff.
Commercial airliners hijacked by al-Qaida terrorists killed nearly 3,000 people in New York City, Pennsylvania and at the Pentagon after they were crashed in all three locations.