WASHINGTON (AP) - Pre-Sept. 11 intelligence conducted by a secret military unit identified terrorist ringleader Mohamed Atta 13 different times, a congressman said Tuesday.

WASHINGTON — The Defense Department on Friday reversed its earlier decision to bar key witnesses from testifying about just how much information the U.S. government had on the Sept. 11 hijackers before they led the attacks that killed 3,000 people.

The Senate Judiciary Committee has therefore scheduled a second hearing for next week on the formerly secret Pentagon intelligence unit called "Able Danger".

Former members of Able Danger say the group identified Sept. 11 hijackers, including Mohamed Atta, more than a year before the attacks. Although those Able Danger analysts say they told the Sept. 11 commission about their findings, former members of the panel have so far dismissed the claim.

J.D. Smith, a defense contractor who claims he worked on the technical side of the unit, code-named "Able Danger", told reporters Friday that he helped gather open-source information, reported on government spending and helped generate charts associated with the unit's work. Able Danger was set up in the 1990s to track Al Qaeda activity worldwide.