From a memorial stair climb to the Ohio Statehouse's annual flag display, a number of local events are planned for the 21st anniversary of the Sept. 11 attacks.

The commemorations come one year after the United States completed its withdrawal from Afghanistan, ending America's longest running war.

In the 2001 attacks, 19 terrorists hijacked four jetliners, crashing two into the World Trade Center in New York and one each into the Pentagon near Washington, D.C., and a field in Pennsylvania. They left nearly 3,000 dead and resulted in lingering health issues for thousands of first responders who worked at ground zero, including increased risk of cancer.

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Here's a look at the events planned for this weekend:

Motts Military Museum, Sunday: The Madison Township Fire Department will hold its annual remembrance ceremony at 1 p.m. at the museum, 5075 S. Hamilton Road. The museum is home to a number of 9/11 artifacts, including a fire truck that was crushed during the collapse of the north and south towers. Its hours on Sunday are 11 a.m. to 5 p.m. and admission will be free.

Marysville Fire Department, Sunday: The department is holding a 9/11 remembrance ceremony at its station, 16300 County Home Road, at 9:50 a.m.

First Responders Park, Saturday: While the city of Hilliard is not hosting a traditional ceremony or observance on Sunday, a police officer will be assigned to First Responders Park and serve as a tour guide there from 10 a.m. to 2 p.m. Saturday. According to its website, the memorial's features include a reflecting pool and a sculpture made from the steel of the World Trade Center.

Washington Township Fire Department, Saturday: The department is hosting a 2 p.m. ceremony at Station 93, 5825 Brand Road.

First Responders Park, Sunday: The city of Westerville will hold a brief program at First Responders Park, 374 W. Main St., at noon. Temporary educational signage and photos will be installed in the park beginning Friday afternoon. According to its website, the park includes "a section of steel known as 'C-40' from the north tower of the World Trade Center that fell during the terrorist attacks on Sept. 11, 2001."

Village Green, Sunday: Organized by the Leasure-Blackston American Legion Post 239, a 9/11 remembrance in the northwest quadrant of the 3.5-acre Village Green will feature speakers and music. It starts at noon.

Did we miss something? Email mtrombly@dispatch.com with more 9/11 events in and around Columbus.

Monroe Trombly covers breaking and trending news.