‘Darker forces of…’: Joe Biden's 9/11 anniversary full video message | Watch

The US marks the 20th anniversary of 9/11 attacks just weeks after its exit from Afghanistan. President Joe Biden urged the nation to reclaim unity that sprung up in days following the September 11 terror attacks. In a video message, the American president commemorated those killed 20 years ago. “In the days that followed September 11, 2001, we saw heroism everywhere, in places expected and unexpected. And we also saw something all too rare - a true sense of national unity. Unity and resilience, the capacity to recover and repair in the face of trauma. Unity and service. The 9/11 generation stepped up to serve and protect in the face of terror, to get those terrorists who were responsible. To show everyone seeking to do harm to America that we will hunt you down and we will make you pay,” he said. Biden was a senator when hijackers commandeered four planes & exacted nation's worst terror attack. The president has planned to pay his respects at the trio of sites where the planes crashed. Meanwhile, family members & friends honoured Flight 93 victims in Shanksville, Pennsylvania. The September 11, 2001 attacks in New York & Washington were visceral in their impact. In less than 3 hours, the twin towers of the World Trade Center were reduced to a mountain of rubble. Attacks killed more than 2,700 people, while hundreds more were killed at the Pentagon.