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Ann Arbor, Mich.

Apart from expanding their presence in countries such as Turkey, the Philippines, Indonesia and Malaysia, terrorists are also moving into the virtual realm by spreading propaganda, attracting recruits and financing their operations via social media and the darknet, Wang said. Darknet refers to a computer network with restricted access used primarily for illegal purposes.

Anton Muscatelli, chairman of the Russell Group, a body representing 24 research universities in the UK, said overseas students could soon comprise up to 50 percent of the student body at many British institutions. This would most likely involve heavy recruitment from India and China, he added.

Another Silicon Valley company to face a security threat in the recent past was YouTube. In April, a woman opened fire at its headquarters in San Francisco, wounding three people before she shot herself dead.

Another company offered to install broadband and a camera in Zhao's home for her to supervise her daughter from the stall.