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SAN BERNARDINO, Calif. - Authorities now believe that the two attackers who killed 14 people last week were both radicalized and had been for quite a while, an FBI official said Monday.

"Both subjects were radicalized and have been for some time," David Bowdich, the assistant director in charge of the Los Angeles Field Office, said at a news conference.

Bowdich touched on the question of whether one of them guided the other down the path of radicalization, saying that police did not know yet when or how this occurred.

"How did that happen and by whom and where did that happen?" he said. "I will tell you right now, we don't know those answers at this point." He added that it was possible there was no "who" responsible for this, but said investigators were still exploring all possibilities.

The couple died in a gun battle with authorities several hours after the attack.

Investigators have found evidence of "preplanning," Bowdich said. Both attackers went to shooting ranges in the Los Angeles region for target practice, including one such visit just days before the shooting, he said.

The federal investigation - which Bowdich described as "massive in scale" - has involved more than 400 interviews, he said.

County officials had said earlier Monday they were returning to work in an attempt to resume normal business, five days after 14 people were killed in a massacre at an event for government workers.

The only exception is the Division of Environmental Health Services, where work will be suspended for at least another week, county officials said at a news conference. One of the two killers, Syed Rizwan Farook, was a department employee.

In an effort to help employees cope with the effects of last week's violence, the county has established a counseling center and hotline, and managers in county government have been asked to look for signs of stress among their staff.

San Bernardino has already taken steps since the Dec. 2 shooting at the Inland Regional Center to enhance security in county facilities, including increasing the number of armed guards at certain facilities, and is considering additional measures.

County officials and physicians from hospitals that treated shooting victims stressed that San Bernardino would seek to remain united and would rally around those affected by the massacre.

"The purpose of terrorism is to make ordinary people afraid to do the ordinary things that make up their lives," said Janice Rutherford, a member of the county Board of Supervisors. "We can't be afraid of our lives, of our community, of our neighbors, of our coworkers."

Of six victims who were admitted to Arrowhead Regional Medical Center after the attack, five have gone home.

The wide-ranging investigation into the deadliest terrorist attack on U.S. soil since Sept. 11, 2001, continued Monday, as officials sought answers about the attack, the suspects, and any ties they may have to other people.

Law enforcement agents on Sunday again searched the home of a man suspected of providing Farook with the military-grade rifles he and his wife used to gun down 14 people.

A team of three officials spent about 30 minutes inside the home of Enrique Marquez, a former neighbor of Farook's, and left carrying a large cardboard box. The box's contents were unknown, and the officials declined to identify themselves or their agency to reporters outside.

The search at the modest suburban home, the second in two days, took place as new details surfaced about Marquez, who officials say bought the DPMS and Smith & Wesson AR-15 rifles that Farook and his wife, Tashfeen Malik, used in the Dec. 2 rampage.

Marquez, who works as a Walmart security guard, checked himself into a mental-health facility Friday; it is not yet clear whether he has already been questioned by authorities or if he will be charged.

On Monday, Bowdich said he would not comment on Marquez's status.

A picture has begun to take shape of the couple's past and their apparent radicalization even as their lives followed a seemingly ordinary course: work, marriage, a child. The couple's daughter, born in May, is in the care of child protective services.

The Marquez and Farook families lived next door to each other on a quiet residential street in Riverside, Calif., for years. Like Farook, Marquez, 29, attended La Sierra High School. Both young men shared a love of cars.

Neighbor Jared Rork said Farook and Marquez would sometimes be seen working on cars and listening to music in one of their garages. "They seemed like everyday, normal Americans," he said.

One of his coworkers at Walmart, who asked to go only by his last name, Dandy, said Marquez had worked at the store only a few months.

When he heard about Marquez's possible role in supplying the weapons used on Dec. 2, Dandy was shocked.

"I was just blown away, man," he said. "I couldn't believe something like that could come here."

Friends and family described Farook, who was born in Illinois and grew up in California, as devout and conservative. Those who prayed with him at local mosques said the 28-year-old spoke about his personal life to few people.

On Sunday, Italian publication La Stampa published an interview with Farook's father, also named Syed, in which he said his son had harbored anti-Semitic animosity.

Reached at his son Raheel's home on Sunday morning, the elder Farook said his views differed from those of his son.

"He was going towards conservatism," he told reporters through the gate of the home. "His views were conservative; my views were liberal."

He also said that Syed Farook had quarreled with a Jewish coworker. One of the fellow county health inspectors killed in the attack was Nicholas Thalasinos, who converted to the Messianic Jewish movement of Christianity three years ago and who frequently posted online about Israel and politics. Thalasinos had been a health inspector in Cape May County more than a decade ago.

Kuuleme Stephens, a friend of Thalasinos', said she had spoken with him by phone about two weeks before the attack, reaching him when he was having a conversation with Farook about the nature of Islam and Israel's place in the Middle East. But "it wasn't an argument," she said.

Investigators are also working to determine what other attacks the couple may have planned.

The rifles they used had been altered to make them more lethal, and a major arsenal was found in their two-story townhouse.