The FBI and Homeland Security have issued a nationwide warning about al-Qaida threats to small airplanes, just days before the anniversary of the 2001 terrorist attacks.
There is no specific or credible terrorist threat for the 10-year anniversary of the attacks on the World Trade Center and the Pentagon, authorities said. But they have stepped up national security as a precaution.
Al-Qaida was considering ways to attack airplanes, as recently as earlier this year, according to a five-page law enforcement bulletin issued Friday.
The alert, issued ahead of the summer's last busy travel weekend, said terrorists have considered renting private planes and loading them with explosives.
