The husband-and-wife terrorists who slaughtered 14 innocent people in California polished their shooting skills at local gun ranges just days before the attack, officials said Monday.

“We do have evidence that both of these subjects […] participated in target practice in some ranges within the metro area or within the Los Angeles area,” said David Bowdich, the FBI’s assistant director in Los Angeles.

“That target practice in one occasion was done within days of this event.”

Syed Rizwan Farook spent several hours at the Riverside Magnum Shooting range on Nov. 29 and Nov. 30, practicing with his own AR-15 assault rifle and handgun — the same type of weapons used during the Wednesdaymassacre, a federal law enforcement source said.

Investigators also believe that Farook and his jihadi wife, Tashfeen Malik, had been “dry-firing” — pulling the trigger of an unloaded gun — in the backyard of a Southern California home as they prepared for the terror spree, the source said.

Meanwhile, federal sources said that all of Farook’s family members and friends are being looked at as the terror investigation continues.

“The mom definitely has exposure as a potential co-conspirator,” a federal source said.

“We are trying to uncover any evidence of her possible involvement which could lead to charges.”

Bowdich said that both Malik and Farook were “radicalized,” adding that they “have been for quite some time.”