WASHINGTON, Feb 9 (Reuters) - FBI Director James Comey said on Tuesday that federal investigators have still been unable to access the contents of a cellphone belonging to one of the killers in the Dec. 2 shootings in San Bernardino, California, due to encryption technology.

Comey told the Senate Intelligence Committee that the phenomenon of communications "going dark" due to more sophisticated technology and wider use of encryption is "overwhelmingly affecting" law enforcement operations, including investigations into murder, car accidents, drug trafficking and the proliferation of child pornography.

"We still have one of those killer's phones that we have not been able to open," Comey said in reference to the San Bernardino attack.

Syed Rizwan Farook, 28, launched the Islamic State-inspired attack with his wife, Tashfeen Malik, 29, at a social services agency in the California city, leaving 14 dead.
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