BATON ROUGE - On this day, 17 years ago, the entire national changed.

Thousands of people lost their lives on September 11, 2001, when terrorists hijacked and crashed four U.S. airplanes.

American Airlines flight 11 crashed into the North Tower of the World Trade Center in New York City and United Airlines flight 175 crashed into the South Tower. American Airlines flight 77 was sent to the Pentagon in D.C.

REMEMBERING SEPTEMBER 11: American flag is unfurled at the Pentagon on the 17th anniversary of the 9/11 attacks. https://t.co/ZjqVAuZvqj pic.twitter.com/hRTEvbfOAU

— ABC News (@ABC) September 11, 2018

A fourth plane, United Airlines flight 93, was heading towards the Twin Towers. Once the passengers and crew learned of the suicide attack, they retook the plane and deliberately crashed it into a field in Pennsylvania.

To remember all the people who lost their lives, there will be multiple ceremonies in the area.

Louisiana Office of State Fire Marshal 9/11 Ceremony

1 p.m. at the Office of State Fire Marshal

8181 Independence Blvd., Baton Rouge

8th Annual 9/11 Remembrance and U.S. Flag Retirement Ceremony

7-8 p.m. at the St. George Fire Department Training Tower

14100 Airline Highway, Baton Rouge

Ascension Parish 9/11 Commemoration Ceremony

11:30 a.m. at Fire Protection District #1 Headquarters

13192 Airline Highway, Gonzales

2nd Annual Prairieville Fire Department 9/11 Memorial Program

 9 a.m. at Ascension Parish Fire District #3

14517 Highway 73, Prairieville

Cry Out American Prayer and Remembrance Service

11:45 a.m. -1 p.m. at the Livingston Parish Council Chambers

20355 Government Blvd., Livingston