WASHINGTON AP) -- Federal authorities have seized the suspected Fort Hood shooter's computer and are looking for clues that may have led to the military massacre on Thursday that left 13 people dead and 30 wounded.

A U.S. law enforcement official said that Maj. Nidal Malik Hasan's apartment in Killeen, Texas, was searched early Friday. It was not immediately known if FBI agents found anything suspicious on Hasan's computer files. A military official said investigators also are sifting through materials Hasan carried with him during the shooting incident and evidence left in his vehicle, which was found parked at the base.

The officials spoke on condition of anonymity because of the ongoing investigation.

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APNP-11-06-09 0710PST