Nicholas Ivie, 30, was the first agent killed since 2010, when a death led to a review of a botched U.S.-run operation.

Although the iPhone 4S scored slightly better than the iPhone 5, the study did show steady improvement from Apple over the years.

"We are evaluating different options for non-core parts, such as real estate holdings,” spokeswoman Maija Taimi said.

David Murray said Microlatch has an agreement with Apple to develop fingerprint-based identification technology.

Protesters say the legislation could be used to target government critics and crack down on freedom of speech.

Worries have also intensified that the U.S. economy will fall off a "fiscal cliff" at the end of the year.

One official said initial reporting suggested militants had begun planning attacks on U.S. targets in Benghazi before September 11.