Barack Obama, Jimmy Fallon, Kaley Cuoco and more remember 9/11

On the 17th anniversary of 9/11, celebrities took to social media to remember the 2,977 victims and pay tribute to the brave first responders who were on the scene of the terrorist attacks.

Former president Barack Obama tweeted, “We will always remember everyone we lost on 9/11, thank the first responders who keep us safe and honor all who defend our country and the ideals that bind us together. There’s nothing our resilience and resolve can’t overcome, and no act of terror can ever change who we are.”

President Donald Trump — who infamously bragged hours after the 2001 tragedy that his building at 40 Wall Street was “the tallest” in downtown Manhattan once the Twin Towers were destroyed — attended a memorial service in Shanksville, Pennsylvania, with his wife, first lady Melania Trump.

“Today, all of America wraps up and joins together. We close our arms to help you shoulder your pain and to carry your great, great sorrow,” he said during a speech that addressed the families of the victims of United Flight 93. “Your tears are not shed alone, for they are shared grief with an entire nation.”

See how stars are honoring the anniversary in the gallery below:

Many stars with ties to New York City also spoke out. Jimmy Fallon, who hosts The Tonight Show at 30 Rockefeller Plaza, wrote on Twitter, “I love you New York City.” Ice-T, whose show Law & Order: Special Victims Unit is based in the Big Apple, tweeted, “It’s 9/11… I actually saw the Towers fall from my apartment window that morning…. Respect to all the victims and people who lost loved ones.”

Michael Strahan tweeted a series of photos of himself and his former New York Giants teammates posing on the field with first responders. “We will never forget the heroes we lost on this tragic day 17 years ago,” he wrote. “Standing side by side with the first responders will always be one of the most special moments of my entire career. #NeverForget.”

Over on Instagram, Kaley Cuoco posted a photo of the World Trade Center. She wrote, “17 years ago .. #neverforget In memory of all the lives lost that day 9/11.” Jersey Shore: Family Vacation star Vinny Guadagninowrote, “As I get older this day gets realer and realer. Thousands of innocent lives who left their families to go to work . People trapped and confused inside the smokey buildings making last calls to their loved ones. Heroes sacrificing their lives by running into the buildings to save strangers , while everyone else was running away. A day like this makes every day problems feel small and puts it all into perspective . #911 #Neverforget.”