SAN BERNARDINO, Calif. (AP) — The latest on the mass shooting at a social services facility in San Bernardino, California (all times local):

9:10 a.m.

President Barack Obama is ordering U.S. flags to be flown at half-staff to honor the victims of the shooting in California that left 14 people dead.

The White House says Obama signed the proclamation Thursday. It calls for flags to remain at half-staff through Monday and affects flags at the White House, public buildings, military installations, U.S. Navy ships, embassies and diplomatic missions.

Obama says it’s possible the massacre was related to terrorism but that authorities still don’t know. He says it’s possible it was workplace-related or that there were mixed motives.

Authorities say Syed Farook and his wife or fiancee killed 14 people at a social service center Wednesday before dying in a gunbattle with police. He fired on colleagues at a holiday gathering for county health employees.

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9:05 a.m.

Divorce papers from the parents of one of the San Bernardino, California, attackers reveal an acrimonious split in which the wife accused her husband of being an abusive alcoholic.

The records obtained Thursday by The Associated Press show that Syed Farook’s mother, Rafia, described her husband in 2006 as “irresponsible, negligent and an alcoholic.”

She said she was forced to move out of her home with three of her children because her husband continually harassed her “verbally and physically and refused to leave the home.”

She filed a no-contact, stay-away domestic violence protection petition on July 3, 2006. She alleged that same year that her husband attacked her while her kids were present, dropped a TV on her and pushed her toward a car.

Authorities say Syed Farook and his wife or fiancee killed 14 people at a social service center Wednesday before dying in a gunbattle with police.

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8:20 a.m.

President Barack Obama says it’s possible the mass shooting in California was related to terrorism but that authorities still don’t know. He says it’s possible it was workplace-related or that there were mixed motives.

Obama is speaking in the Oval Office. He’s assuring Americans that authorities will get to the bottom of what happened. The president also is calling for people to wait for facts before making judgments.

Obama says many Americans feel there’s nothing they can do about mass violence. But he says “we all have a part to play.”

The president says the nation must make it harder to carry out violence but acknowledged that the threat can’t be eliminated completely. He says it will be important for all Americans, including state legislatures, to see what they can do.

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8:10 a.m.

Ten shooting victims are being treated at two hospitals following the massacre in San Bernardino, California.

San Bernardino County spokeswoman Felisa Cardona says all five patients at Arrowhead Regional Medical Center are in stable condition Thursday morning. She says one other patient left the hospital after being treated Wednesday.

Loma Linda University Medical Center is treating five patients for gunshot wounds. CEO Kerry Heinrich says two are in critical condition and three are in fair condition.

Heinrich praised first responders and hospital staff, saying “there’s nothing really you can do to prepare for an event like yesterday.”

Authorities say Syed Rizwan Farook and his wife or fiancee, Tashfeen Malik, killed 14 people in a precision attack Wednesday at a social service center before they died in a gunbattle with police.

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6:45 a.m.

U.S. Attorney General Loretta Lynch says the Justice Department will be offering “any and all assistance necessary” as the investigation into the California mass shooting continues.

Lynch is speaking at an event about criminal justice at the White House. She says the shooting in California was “unspeakable.”

Lynch says the government doesn’t know a lot yet about the incident. But she says the FBI, the U.S. Marshals Service and other federal authorities have been dispatched.

The attorney general says whatever the results of the investigation, there’s no place for this type of violence in the U.S. She says that’s not what the country stands for or works for.

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5:40 a.m.

Police and federal agents are for a second day searching a home in connection to the massacre in San Bernardino, California.

A search team combed the residence early Thursday in neighboring Redlands, about 7 miles from the shooting at Inland Regional Center.

A black sedan parked outside was also searched.

The home is where officers initially saw a vehicle matching the description of the suspects’ SUV in the hours before the final gun battle that killed them. A bomb squad on Wednesday swept the building with robots.

Police didn’t immediately say if the suspects — Syed Rizwan Farook and Tashfeen Malik — lived at the home. Public records show it is a possible residence of a family member of Farook.

Residents tell KABC-TV Redlands is a “sleepy little town” and expressed shock that the killers might be their neighbors.

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3 a.m.

Federal authorities say that the two assault rifles and two handguns used in the San Bernardino massacre were all purchased legally in the United States — two of them by someone who’s now under investigation.

Meredith Davis of the Bureau of Alcohol, Tobacco, Firearms & Explosives says investigators are now working to make a connection to the last legal purchaser.

She says all four guns were bought four years ago but she’s not saying whether they were purchased out of state or how and when they got into the hands of the two shooters.

Davis says California requires paperwork when guns change hands privately but many other states don’t.

She also says the rifles involved were .223-caliber — powerful enough to pierce the standard protective vest worn by police officers, and some types of ammo can even plow through walls.