The current threat from al-Qaida is diffused. It relies on homegrown, lone-actor terrorists to carry out low-end attacks, such as stabbing and vehicle ramming.

Twenty five years after al-Qaeda struck inside the U.S. homeland, authorities are warning that the threat from foreign terrorist organizations has hardly gone away.

Al-Qaeda is back in Afghanistan, but no attacks have been launched from the country so far (except those into Pakistan). Should we feel safe?