US President Barack Obama is "troubled" by cyberattacks on Internet titan Google and wants answers from China, the White House said.

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Gen. David Petraeus, head of U.S. Central Command, ruled out sending U.S. troops to Yemen, where the al Qaeda affiliate that has claimed responsibility for the attempted Christmas Day airline bombing is based.

A powerful 6.5-magnitude earthquake struck off the coast of northern California, the US Geological Survey said. The quake occurred 22 miles (35 kilometers) west of Ferndale and 224 miles (360 kilometers) northwest of Sacramento, at a depth of nine mi