Pete Davidson's mom posts touching tribute about her late husband who died in 9/11 attacks

The mother of Pete Davidson has posted a touching tribute to her late husband on the 22nd anniversary of the September 11 terror attacks.

The comedian has been open in the past about how his firefighter dad died back in 2001 while responding to the Twin Towers being hit by hijacked planes.

Many around the world have paused to reflect on the devastating moment that changed the world more than two decades ago.

Amy Davidson was one of them and she posted a series of photos of Scott and her family before that fateful day.

"Happiest days of my life and I didn’t know it," she said. "Never forget and always be grateful."

There were several shots of Scott playing with his children and many viewers were moved to tears.

One user wrote: "Your son has done an amazing job keeping his memory alive. Only last night did I tell your husbands story to my 7 year old to explain how brave the emergency services were that day."

Another added: "Thinking of you and others I know especially today. Your courage is a testament to the human spirit."

A third said: "Sending so much love and support. He would be so incredibly proud of you and Pete and Casey."

Scott was only 33 years old when the September 11 terror attacks unfolded in the United States.

Terrorists crash two commercial aircrafts into the Twin Towers of the World Trade Center in New York City.

The skyscrapers ended up collapsing and caused dust and smoke plumes so big that could be seen from space.

A third plane also slammed into the Pentagon, while a fourth – United Airlines Flight 93 – crashed in Pennsylvania after the passengers fought back.

The attacks killed nearly 3,000 people, and injured thousands more.

Scott Davidson was one of the many firefighters who was on duty that day in NYC and he rushed to help those affected by the tragedy.

According to the National Fallen Firefighters Foundation, he responded to the call after a second hijacked airliner struck the World Trade Center.

It’s believed Scott was last seen running up the World Trade Center’s stairs, just before it collapsed.

The Foundation says on its website: “Scott’s acts of heroism are not surprising.

“He was a brave and fearless man and a devout patriot. He was a friend to many‚ and will be sorely missed by us all.”