SAN BERNARDINO, Calif. — It's still unclear why a heavily armed couple burst into a facility for the developmentally disabled in Southern California and carried out one of the deadliest mass shootings in U.S. history, but on Thursday investigators revealed more about the cache of weapons the pair had at their disposal.
Syed Rizwan Farook and Tashfeen Malik, who were killed in a shootout with police, allegedly stashed three pipe bombs at Inland Regional Center before they fled the scene in an SUV Farook rented days ago, San Bernardino police chief Jarrod Burguan. Those bombs were rigged to a remote-controlled car and failed to work, Burguan said.
When officers went to the couple's home in Redlands, Calif., they found 12 pipe bombs and hundreds of tools and other materials that could be used to make improvised explosive devices, Burguan said.
They also found more than 4,500 rounds of ammunition.
Police said the firearms and ammunition were all legally bought and registered.
A terrifying morning in San Bernardino
It started at a holiday party -- perhaps with a slight or a testy exchange, something that prompted Syed Rizwan Farook to storm off angrily.
It ended in a bloodbath -- with 14 dead and 21 wounded, Burguan said. It was the deadliest mass shooting in the United States since Sandy Hook.
Dressed in black tactical gear, carrying semi automatic rifles, the pair unleashed a massacre at the Inland Regional Center, a facility for the developmentally disabled in San Bernardino, a desert town about 60 miles east of Los Angeles. They fired between 65 and 75 rounds inside the facility.
That was their first brazen act. Then they led police on a chase. Farook fired while Malik drove.
They died in a hail of bullets when they tried to take on 23 officers.
Those officers fired about 380 rounds at the suspects, who fired about 76 rounds at law enforcement, Burguan said.
When the gunfire was over, the couple was dead and thousands of spent bullet casings littered the pavement.
On their bodies and in their vehicle, the couple had 1,400 .223-caliber rounds and 200 .9-mm rounds, Burguan said.
When officers went to the couple's home in Redlands, Calif., they found 12 pipe bombs and hundreds of tools and other material that could be used to make improvised explosive devices, Burguan said. They also found more than 4,500 rounds of ammunition at their home.
The mass shooting
It was about 11 a.m. when Farook and Malik opened fire.
A text message hit Terry Pettit's phone from his daughter who was inside Inland Regional.
"Shooting at my work. People shot," she wrote. "Pray for us. I am locked in an office."
Denise Peraza was also inside the center when she was shot in the back. She called her sister Stephanie Baldwin, thinking it might be time to say goodbye.
"As soon as the gunfire started, everyone dropped to the floor and they were underneath desks, and she was trying to shield herself with a chair, along with a man next to her," Baldwin told CNN affiliate KABC. "Then, all of a sudden, she said she just felt (the bullet) going through her back."
"I just want to tell you that I love you," Peraza told Stephanie Baldwin over the phone through tears.
Peraza survived. She is in a hospital and is expected to recover.
Police have not released the names of those who died.
Within minutes, troops of officers were storming the building searching for an active shooter. They counted the dead -- and shuttled the wounded out to triage.
"We had to come out with our hands up and be escorted across the street to the golf course," a woman who works at the center told KCAL/KCBS.
"We stood there for hours, hours witnessing clothing of deceased ones on the street, people crying, co-workers crying, us wanting to get to our children."
But Farook and Malik slipped away in a black SUV.
Not for long. Acting on information that quickly pointed police to Farook, they went to his home in Redlands with a search warrant.
A black SUV drove by them. Slowly at first, then it sped away.
A police car took up pursuit, as the SUV raced back in the direction of San Bernardino. While Malik drove, Farook opened fire out of the vehicle.
Nearly two dozen officers returned fire. When the SUV came to a halt, it was riddled with bullet holes. The couple inside was dead.
Two officers were wounded, but their injuries are not life-threatening, Burguan said. One suffered a gunshot wound to the leg, while the other suffered cuts to his leg that likely came from broken glass or shrapel, the chief said.
In the chaos, police encountered a third person who was running away.
Burguan on Thursday said that third person was not involved in the shooting. He did, however, have an active misdemeanor warrant and was booked on that warrant.
Police said they feel confident that there were only two shooters -- Farook and Malik -- and there is "no credible information" to indicate any additional threats.
Still, mass shootings involving more than one shooter are extremely rare: two of the 28 deadliest shootings since 1949 in the United States have had more than one shooter.
Two .223 caliber rifles were in the car with them, along with two pistols. They were legally purchased, police said.
Two handguns traced back to Farook, an official said. He bought them three to four years ago.
Someone else bought the two rifles, possibly a former roommate -- also legally three or four years ago. That person isn't believed to have anything to do with the shootings, the official said.
"I think that what we have seen and how they were equipped, there had to be some kind of planning in this," Burguan said.
Back at Inland Regional, there was still danger to be dealt with -- three explosives the pair had left behind.
They were "pipe bomb type design," Burguan said. Police secured them and remotely detonated them.
The explosives had been rigged to a remote control for a toy car, an official said. That remote was found inside the SUV. And in the vehicle was another pipe-like device, but it was not an explosive, Burguan said.
In Redlands, officers sent in a robot to check Farook's residence, which they held surrounded into the night.
Farook, an American citizen, was an environmental health specialist with the San Bernardino County health department, which was hosting the holiday party at Inland Regional.
He had worked there for five years.
In an online profile, he described himself as a "22-year-old Muslim Male living in USA/California/riverside. Religious but modern family of 4, with 2 girls and 2 boys."
He "enjoys working on vintage and modern cars, reads religious books, enjoys eating out sometimes. Enjoys travelling and just hanging out in the back yard doing target practice with his younger sister and friends," his profile read.
Farook's brother-in-law Farhan Khan was crushed at the news.
"I have no idea why he would he do something like this. I have absolutely no idea. I am in shock myself," Khan said. "I don't have words to express how sad and how devastated I am."
Khan said he last talked to Farook a week ago. Farook's family had tried to reach him Wednesday but could not all day.