What Kind Of Guns Did San Bernardino Shooters Use?

Update: Late Wednesday evening, police confirmed 28-year-old Syed Rizwan Farook and 27-year-old Tashfeen Malik were the two suspects killed by police in connection to a mass shooting at Inland Regional Center in San Bernardino, California. After fleeing the scene of the shooting, Farook and Malik's SUV was tracked to nearby Redlands, California, where they died in a shootout with police. A third person who fled the site of the police gunfight was detained, though authorities said they did not believe he was directly involved in the shooting that left at least 14 people dead and 17 injured. As of early Thursday morning, officials have not disclosed a motive for the attack. Terrorism has not been ruled out.

Earlier: On Wednesday, police responded to active shooters at the Inland Regional Center in San Bernardino, California, about 60 miles east of Los Angeles. At least 20 people were injured, and the San Bernardino County Sheriff's Department tweeted that there were between one and three possible suspects. As the debate around mass shootings and gun control escalates, many people want to know what kind of guns the San Bernardino shooters used, and an eyewitness source told ABC7 that three shooters were armed with long rifles at the scene.

Late Wednesday evening, police told CNN that all four guns recovered at the scene were fully traced. At least two of the four guns recovered were purchased legally. At least one was traced back to a name of someone who was directly associated in the investigation. The Los Angeles Times reports that the San Bernardino Police Chief Jarrod Burguan said the suspects were armed with long guns, or assault rifles.

The Inland Regional Center where the shooting broke out serves more than 30,000 Californians with developmental disabilities. It's unclear how many people were there at the time, though dozens were seen exiting the building with their hands up. The facility's website says it's a "a nonprofit, private community-based agency that is proud to help obtain services and support for our constituents." Police searched the building, telling ABC7 that the shooters were wearing ski masks. According to ABC7, no suspects were in custody early Wednesday afternoon, and up to 12 victims died.

Traffic was completely blocked off in the area surrounding Orange Show Road and Waterman Avenue, and the sheriff's department urged people on Twitter and Facebook to avoid the area.

This story is developing...