(CBS) — A photograph of the married couple who carried out a mass shooting in San Bernardino, Calif. shows them entering the U.S. at O’Hare Airport in July, 2014.

Tashfeen Malik is dressed in black looking forward while Syed Farook is standing behind her with a beard and glasses. Farook was an American citizen and his wife was originally from Pakistan.

Tashfeen Malik and Syed Farook at O'Hare Airport in July, 2014.

Tashfeen Malik and Syed Farook at O’Hare Airport in July, 2014.

14 people were killed in last week’s attack during a holiday party at a San Bernardino social services center. Farook and Malik were both later killed by law enforcement.

President Barack Obama called the attack an “act of terrorism.”