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Officials have told NBC News that it was likely a man called Syed Farooq and a woman, who one person described as his fiancee, were involved in the attack on a San Bernardino social services facility on Wednesday.

A third person who had been sought following the attack now appeared less likely to have been involved, the sources told NBC.

Up to three attackers opened fire at the Inland Regional Center facility, killing at least 14 people and wounding as many as 17, before fleeing the scene in a black SUV.

The hunt for the black SUV led police to an address in the neighboring town of Redlands, and police chased a vehicle that was seen leaving that address to travel back to San Bernardino. San Bernardino Police Chief Jarrod Burguan said the chase ended with officers engaging in a gun battle with a man and a woman, both of whom were armed with assault rifles and hand guns.The man and the woman were killed in the shootout.

A police officer was been injured in the gun fight but the injuries were not life threatening, the police chief said.
     A third person was seen running from the vehicle and had been detained, Burguan said, adding in reference to the third person that "we do not know that they were involved" in the attack at the Inland Regional Center facility in San Bernardino.

Burguan said the two suspect were dressed in dark, "assault-style" clothing and that there was "sensitive stuff" around the vehicle, which police were searching to ensure there were no explosives inside. There were also reports that an explosive device had been found at the San Bernardino facility during a police sweep after the attack.

Multiple sources from multiple agencies identified one of the three attackers at the facility to NBC as Syed Farook. A person named Syed Farook is listed in public records as a resident of the Redlands address from which police tracked the SUV involved in the shootout, NBC reported.

David Bowdich, head of the Los Angeles FBI office, said federal agents and local law enforcement were being cautious about entering the Relands house because of concerns about explosives that might have been left there.

Reports first surfaced around 11:15 a.m. PT of a shooting near the Inland Regional Center.

At an early press conference after the attack, Police Chief Burguan said that the shooters were armed with long guns — not hand guns — and that preliminary information indicated they were ready for the attack. "They came prepared to do what they did, as if they were on a mission," he said.