Pakistani authorities have banned instant messaging and internet telephony services including Skype, WhatsApp and Viber in the province of Sindh for three months for security reasons, a government spokesman said. Karachi, a city of 18 million people and both the capital of Sindh on Pakistan's southern Indian Ocean coast and the country's financial hub, is plagued by Islamist militant and sectarian violence as well as kidnappings and contract killings.
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