The number of people injured in Wednesday's San Bernardino shooting has increased from 17 to 21 and police have detailed the massive arsenal of weapons and ammunition that the two shooters had on hand when they attacked.
Suspected shooters Syed Rizwan Farook and Tashfeen Malik were fatally shot by police after a chase a few miles from the Inland Regional Center, where the attack occurred.
San Bernardino Police Chief Jarrod Burguan said they had hundreds of rounds of ammunition in their rented car when they fled the scene. Investigators also searched their home Wednesday night and found a dozen pipe bomb-style devices inside. Hundreds of tools that police said could be used to build improvised explosive devices (IEDs) were also found in the house and the garage.
Inside the rental car that was the scene of their final shootout, police found over 1,400 rounds for the assault rifles and over 200 rounds for the two handguns. Police fired 380 rounds at the suspects during that shootout and the suspects, including the female suspect who was sitting in the back of the car and firing at police, shot 76 rifle rounds at officers.
A FBI agent searches outside a home in San Bernardino, Calif., Dec. 3, 2015.
The motive of the shooting is still unknown, but Burguan said investigators do not believe there was an individual target in the shooting, which left 14 people dead.
"They sprayed the room with bullets," Burguan said at a news conference today.
The shooting, which is the deadliest mass shooting in the United States since the 2012 Newtown Elementary School massacre in Connecticut, took place at a conference and holiday luncheon for the San Bernardino County Health Department.
The personal history of the two suspects is beginning to come to light, but it has been confirmed that they had a child together and had dropped off the baby with one of their mothers, saying they had a doctor's appointment, Council on American-Islamic Relations-Los Angeles Executive Director Hussam Ayloush told ABC News.
Farook's brother-in-law said the pair got married two years ago, but police have not confirmed the nature of their relationship.
The U.S-born Farook had worked for the county for five years, police said, adding that he was at the event earlier Wednesday but left at some point.
"He did leave the party early under some circumstances that was described as angry or something of that nature," Chief Burguan said.
Syed Rizwan Farook, is seen here in an online dating profile photo.
Police initially reported that there was a third suspect, but now say Farook, 28, and Malik,27, were the only two shooters involved in the attack.
"We initially put out that there was information that there was upwards of three shooters," Burguan said. "It really looks like we have two shooters that we believe went into the building are the two shooters that are deceased."
In addition to the two assault rifles and two semi-automatic handguns that were used in the shooting, all of which were purchased legally, according to law enforcement sources, investigators also found three pipe bomb-style devices attached together at the scene of the attack that investigators believed to be explosive devices. They were disposed of by the bomb squad.
Law enforcement sources tell ABC News the IEDs found in the building were remote detonated devices. The devices were described by one source as “rudimentary.” Sources believed the bombs used radio-controlled activation of the kind used on toy remote control cars.
The galvanized pipe used in the bomb construction was shaped like an elbow and had metal end caps. Sources say the explosive filler was likely black powder or smokeless powder, commonly known as gun powder.
The shooters came prepared for their assault in tactical type clothing. As one source put it, they were “dressed to kill.”
During the investigation, sources say that the suspects’ house has not yielded the makings of large scale bomb factory, but authorities will certainly be looking at any recent purchases at hardware stores for supplies.
A police officer lights up flares near the scene where a shootout took place, Dec. 2, 2015, in San Bernardino, Calif.
Police were able to track Farook and Malik down after following "some tips" leading to a home in the nearby city of Redlands.
"When officers set up on the residence to watch it, there was a vehicle seen leaving that was suspected of possibly being involved," Chief Burguan said. "There ended up being a pursuit of the vehicle and that pursuit came back to ... the city of San Bernardino where the suspect vehicle stopped and there was an officer-involved shooting."
Footage of a bullet-riddled SUV was made by news helicopters and one of the suspects appeared to be lying in the street while another body was seen later being removed from the vehicle.
