A FBI agent searches outside a home in San Bernardino, Calif., Dec. 3, 2015.

Flowers are left by the side of the road as a San Bernardino police officer blocks the road leading to the site of yesterday's mass shooting, Dec. 3, 2015 in San Bernardino, Calif.

An investigator walks with a yellow tape near a Black SUV that was involved in Wednesday's police shootout with suspects, Dec. 3, 2015, in San Bernardino, Calif.

An investigator looks at a Black SUV that was involved in a police shootout with suspects, Dec. 3, 2015, in San Bernardino, Calif.

Authorities investigate the scene following a shootout, Dec. 2, 2015, in San Bernardino, Calif.

Police vehicles line the street around a vehicle following a mass shooting in San Bernardino, Calif., Dec. 2, 2015.

San Bernardino Police Chief Jarrod Burguan speaks at a news conference, Dec. 2, 2015, in San Bernardino, Calif.

A police officer lights up flares near the scene where a shootout took place, Dec. 2, 2015, in San Bernardino, Calif.

Authorities surround the scene following a shootout, Dec. 2, 2015, in San Bernardino, Calif.

A SWAT vehicle carries police officers near the scene of a shooting in San Bernardino, Calif., Dec. 2, 2015.

Teresa Hernandez, facing camera, is comforted by a woman as she arrives at a social services center in San Bernardino, Calif., where one or more gunmen opened fire, shooting multiple people, Dec. 2, 2015.

A California Highway Patrol officer stands with his weapon as authorities pursued the suspects in a shooting that occurred at the Inland Regional Center, Dec. 2, 2015 in San Bernardino, Calif.

Employees and other people are evacuated by bus from the site of a mass shooting at the Inland Regional Center Dec. 2, 2015 in San Bernardino, Calif.

San Bernardino Police Chief Jarrod Burguan, right, talks to the media near the the site of a mass shooting, Dec. 2, 2015, in San Bernardino, Calif.

A woman wipes her tears at a community center where family members are gathering to pick up survivors after a shooting rampage that killed multiple people and wounded others at a social services center in San Bernardino, Calif., Dec. 2, 2015.

Two women embrace at a community center where family members are gathering to pick up survivors after a shooting rampage that killed multiple people and wounded others at a social services center in San Bernardino, Calif., Dec. 2, 2015.

Two women speak with a firefighter at the triage area near the scene of a shooting in San Bernardino, Calif., Dec. 2, 2015.

Survivors are evacuated from the scene of a shooting on Dec. 2, 2015 in San Bernardino, Calif.

A spent cartridge lies on the ground as police officers secure the area after at least one person opened fire at a social services agency in San Bernardino, Calif., Dec. 2, 2015.

San Bernardino police offices in SWAT gear secure the scene where a mass shooting occurred at the Inland Regional Center on Dec. 2, 2105 in San Bernardino, Calif.

A swat team arrives at the scene of a shooting in San Bernardino, Calif., Dec. 2, 2015. Police responded to reports of an active shooter at a social services facility.

Police at the scene of a shooting on Dec. 2, 2015 in San Bernardino, Calif.

Police respond to the scene of an active shooting in San Bernardino, Calif., Dec. 2, 2015.

A scene from a shooting situation in San Bernardino, Calif., Dec. 2, 2015.

A scene from a shooting situation in San Bernardino, Calif., Dec. 2, 2015.