Mourners in Shanksville mark 20 years since 9/11

LA Times

Photos: A look back at scenes from the 9/11 attacks

Twenty years after terrorists crashed hijacked planes into New York’s World Trade Center, the Pentagon and a field in Pennsylvania, the U.S. is still reckoning with the attack that toppled the twin towers, killed nearly 3,000 people, triggered a wave of increased security and launched a war on terrorism.