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Photo shows San Bernardino shooters arriving in U.S.

The young couple are not smiling. She is wearing a black hijab, a traditional Islamic head covering, and he is bearded and bespectacled. Their expressions are impossible to read, making it difficult at the time to predict that they would become responsible a year and a half later for one of the worst mass shootings in U.S. history in San Bernardino.

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Tashfeen Malik, left, and Syed Rizwan Farook are seen as they arrive in Chicago in 2014 Photo taken by US Customs and Border Protection

CBS News has obtained and verified the photo of Syed Rizwan Farook and Tashfeen Malik as they arrived in the U.S. for the first time on her fiancé visa in Chicago.

New details of San Bernardino shooting emerge

Farook had traveled to Saudi Arabia about two weeks before the July 27, 2014, photo was taken to pick her up and escort her here. Few details are available on how the couple met initially.

FBI Director James Comey said after the shooting that officials are combing through a "very large volume of electronic evidence" that the pair tried to hide from law enforcement, but the source of their radicalization is still far from clear.

A U.S. law enforcement official tells CBS News that Malik expressed radical Islamic views before she entered the U.S. and continued after she arrived. The source says she was expressing those views since 2013 on her Facebook page.

According to the law enforcement source, she also talked about the treatment of Muslims around the world.

Chaz Harrison told CBS News he met Farook in college in 2008, and that he was talkative. However, he was not very open about his wife, describing Farook as very "secretive" and someone "didn't want to reveal too much about his wife."

"One of the first things I said, 'Hey you got a picture?' He didn't have any pictures," Harrison said. "He said that she was very uncomfortable. Everyone looked at her -- they stared her because of the way she dressed.

"He was very secretive about his wife," Harrison added. "He didn't want to reveal much about his wife. I could see he wasn't really comfortable talking about it but what he did tell me, she was a pharmacist in her country. He also told me that, she didn't want to be here neither."

Just before the shooting, Malik pledged her allegiance to ISIS leader Abu Bakr al-Baghdadi in an online posting. However her radicalization is thus far a public mystery. Those who knew her called Tashfeen Malik a "modern girl" who became deeply religious, never an extremist.

Few details have emerged about Malik's life in Pakistan, where she lived from 2007 to 2014 before heading to the United States on a fiancee visa. Malik studied pharmacy at the Bahauddin Zakariya University in the central city of Multan, where she got a degree in 2013.

Shooter's co-worker on the San Bernardino shooting

She also took classes at the Multan branch of Al-Huda International Seminary, a women-only madrassa with branches across Pakistan and in the U.S. and Canada. The school has no known links to extremists, and in Pakistan it is popular among upper-middle class and urban women.

CBS News' Carter Evans reports that both Farook and Malik were generally quiet students and both became deeply religious. And on Sunday, CBS News heard from Farook's father at his Southern California home.

The elder Syed Farook told the Italian newspaper La Stampa, "My son said he shared (ISIS leader Abu Bakr) Al Baghdadi's ideology, and supported the creation of the Islamic State. He also was obsessed with Israel."

Also on Monday, a custody hearing was held but no long-term decisions were made on the status of the 6-month-old daughter of the couple.

Saira Khan, the older sister Farook, is seeking to adopt the child.

The Council on American-Islamic Relations, whose attorney is representing Khan, said in a statement Monday that the child remains in the custody of San Bernardino County Child Protective Services and another hearing has been scheduled for next month.

CAIR says it is seeking to have the child placed with a Muslim foster family and to be reunited with relatives as soon as possible.

The county has declined comment on the child's status.

The couple left the girl with family members saying they were headed to a doctor's appointment before Wednesday's shooting at a holiday party.