Wednesday marks the 18th anniversary of the Sept. 11, 2001 terrorist attack on America.

Two hijacked planes flew into the World Trade Center and one into the Pentagon. Another hijacked plane crashed in a field in Pennsylvania when the crew and passengers attempted to regain control of it.

Nearly 3,000 people were killed and about 6,000 injured that day, making it one of the deadliest attacks on U.S. soil.

One hundred sixty-one people with ties to Connecticut were killed.

Several area events are scheduled to honor and remember those lost on the day of the attack and then in subsequent years.

Danbury’s ceremony is set from 5 to 6 p.m. at the 9/11 Memorial in Elmwood Park.

The 9/11 Memorial is a 12-foot glass tower which is lighted from dusk to dawn and includes the names of the Connecticut victims. It was dedicated in 2004.

New Milford will hold its annual ceremony at the memorial on Patriots Way near the railroad station. Guests are invited to start gathering at 8 a.m. and the service will begin at 8:46 a.m. with a bell toll.

The ceremony will include comments from elected officials, an invocation, music and a presentation of the flag by first responders, including EMTs, police and fire departments.

The state will illuminate the Pearl Harbor Memorial Bridge in New Haven with red, white and blue lights and beacons.

Connecticut’s official memorial was last week at Sherwood Island State Park in Westport.

The state park was chosen as the site for the memorial because many people gathered there in the immediate aftermath of the attacks to observe the devastation on lower Manhattan across the Long Island Sound.

The park was used in the following days and weeks as a staging area for Connecticut’s relief efforts to New York City.

“The impact of one of the greatest tragedies in American history still reverberates today, and out of the sorrow we must forever hold onto the spirit of unity and compassion that bonded all of us as a nation and as a people in the following weeks, months, and years,” Gov. Ned Lamont said in a news release.

“Tragedy struck incredibly close to home,” he said. “We will forever pay tribute to the innocent lives that were taken all too soon, and honor the heroism of those who gave their lives while rescuing their fellow man, including many first responders. We continue to pray for the men and women of the Armed Forces serving our nation overseas and protecting our freedom, as well as the many military heroes whose lives were lost in the ongoing battle to keep us safe since 2001.”