(WTNH) — Several memorials and ceremonies are being held across the state to honor the victims of the 9/11 terrorist attacks.

Wednesday marks eighteen years since terrorists hijacked four planes in 2001, crashing them into both the World Trade Center towers in New York and the Pentagon in Washington. The fourth plane went down in a field in Pennsylvania.

Ceremonies are being held across the state today in several towns including Milford, Middletown and Mystic. Governor Lamont has also ordered all flags at half staff.

18 years ago today, the following events occurred:

8:46 a.m.: Hijackers crash American Airlines Flight 11 into floors 93 through 99 of the North Tower

9:03 a.m.: Hijackers crash United Airlines Flight 175 into floors 77 through 85 of the South Tower

9:37 a.m.: Hijackers crash American Airlines Flight 77 into the Pentagon, near Washington, D.C.

9:59 a.m.: The South Tower collapses.

10:03 a.m.: After learning of the other attacks, passengers on United Airlines Flight 93 launch a counterattack on hijackers aboard their plane to try to seize control of the aircraft. In response, the hijackers crash the plane into an empty field near Shanksville, Pa.

10:28 a.m.: The North Tower collapses. The 16-acre World Trade Center site is in ruins, with collateral damage affecting all adjacent properties and streets. A rescue and recovery effort begins immediately.

Bridgeport

• Moment of Silence Ceremony
• Wednesday, September 11, 2019 at 8:30 a.m.
• Fire Department Headquarters, 30 Congress Street

Farmington

• UConn Health to Commemorate 18th Anniversary of 9/11
• Wednesday, September 11, 2019 from 12 p.m. – 1 p.m.
• Keller Auditorium, UConn Health, 263 Farmington Avenue

Groton

• Flag Retirement Ceremony
• Wednesday, September 11, 2019 at 8:30 a.m.
• Historic Ship Nautilus & Submarine Force Museum, 1 Crystal Lake Road

Meriden

• Meriden Police, Fire and Hunters EMS pay tribute to those who lost their lives on Sept. 11, 2001
• Wednesday, September 11, 2019 at 8 a.m .
• Meriden City Hall, 56 E Main Street

Middletown

• Middletown September 11th Remembrance Ceremony
• Wednesday, September 11, 2019 at 8:30 a.m.
• Veterans Memorial Park on Walnut Grove Road

Milford

• Mayor Blake invites community to September 11th Remembrance Ceremony
• Wednesday, September 11, 2019 at 8:30 a.m.
• Live Oaks School 9/11 Memorial Garden, 575 Merwin Avenue

Mystic

• Screening of Fireboats of 9/11, Open tours of Fire Fighter vessel
• Wednesday, September 11, 2019 from 9 a.m. – 5 p.m.
• Mystic Seaport Museum, 75 Greenmanville Avenue

New Haven

• September 11 Tribute
• Wednesday, September 11, 2019 from 12:15 p.m. – 1:00 p.m.
• 1 State Street

New London

• 9/11 Remembrance Ceremony
• Wednesday, September 11, 2019 at 8:30 a.m.

Plantsville

• 9/11 Memorial Service
• Wednesday, September 11, 2019 at 8:30 a.m.
• On the corner of Summer Street and Main Street in Plantsville

Wallingford

• 9/11 Remembrance
• Wednesday, September 11, 2019 at 6:30 pm
• Wallingford Town Hall, 45 S Main Street

West Haven

• 9/11 Flag-raising Ceremony
• Wednesday, September 11, 2019 at 6:30 p.m.
• William A. Soderman Memorial Flagpole, Bradley Point Park, Captain Thomas Boulevard

• Candlelight Vigil
• Wednesday, September 11, 2019 at 7 p.m.
• Richard S. Gabrielle Sept. 11 Memorial, Savin Rock Beach Walk, Captain Thomas Boulevard