Eric Holder: Homegrown Terror Threat Is Cause For Concern (VIDEO)

WASHINGTON - Attorney General Eric Holder says he's worried about terrorist attacks on the U.S. by Americans. And high on his list of concerns is the threat posed by anti-American cleric Anwar al-Awlaki, a U.S. citizen believed to be hiding in Yemen.

Holder says al-Awlaki has a familiarity with the U.S. that terrorists usually lack. He says he puts him on the list of people who worry him the most, along with al-Qaida head Osama bin Laden, but adds, "Whether he's one, two, three, four, I don't know."

In an interview on ABC's "Good Morning America," Holder said the terrorism threat is real and constant. He says he's concerned that the authorities may have missed a signal that an attack is coming.

He says Americans have to be prepared for "potentially bad news."

During the appearance, Holder also addressed subjects such as Wikileaks and Guantanamo Bay detention camp.