TERRORIST THREATS REDEFINED 20 YEARS AFTER 9/11

Experts warn that main danger to US could come from within

Most people need no reminder that Saturday marks the 20th anniversary of the worst terror attacks on United States soil, in which nearly 3,000 people died.

This is not just because the post-9/11 era began in Afghanistan and ended there with US troops rushing to withdraw just days ago. Neither is it due to the Afghan war, along with the conflict in Iraq－launched by Washington in the wake of 9/11－which have cost US lives and trillions of dollars.

The specter of the attacks lingers, serving as a constant reminder. In Washington, for example, the unofficial slogan of the post-9/11 US－"If you see something, say something"－can still be seen on billboards and public transportation. At airports, tightened security measures have made travel more stressful than ever for passengers and reduced their privacy.