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San Bernardino Gunman Syed Farook Practiced at Range Days Earlier

Syed Farook was using an assault rifle that looked similar to the one used in the attack.

San Bernardino gunman Syed Farook spent hours practicing his marksmanship at a shooting range the Monday before the mass murder at the Inland Regional Center, NBC News has learned.

A person closely tied to the Riverside Magnum Range told NBC that Farook practiced on Sunday and for two to three hours Monday with numerous weapons, including an assault rifle that appeared similar to the one used in Wednesday's attack.

A senior federal law enforcement official confirmed to NBC News that Farook spent time firing at the Magnum shooting range in Riverside, California.

Related: Photo Shows San Bernardino Killers Entering the U.S.

The range, according to the source connected with it, turned over extensive video of the target practice to the FBI within hours of the assault. At a news conference Monday, federal officials also confirmed that Farook's wife, Tashfeen Malik, was also seen practicing at area ranges.

Farook, who was also armed with handguns, was said to have “looked normal” and raised no suspicions.

He was also, a source said, “a pretty good shot.”