Pakistani authorities have blocked access to the social media website Twitter because of messages they say are offensive to Islam.
They talked of "blasphemous and inflammatory" material although it is not clear exactly what the tweets said.
Some officials mentioned a 2010 Facebook competition involving pictures of the Prophet Muhammad, considered blasphemous by Muslims.
At that time access to about 1,000 websites was blocked.
The ban in 2010 lasted for around a fortnight until Facebook blocked access to the controversial page in Pakistan.
The new ban on Twitter comes just hours after Pakistan's Interior Minister, Rehman Malik, said there were no plans to block access to the site.
The Indian news agency PTI reported a tweet sent by Mr Malik: "Dear all, I assure u that Twitter and FB will continue in our country and it will not be blocked. Pl do not believe in rumors," it said.
But the chairman of the Pakistan Telecommunications Authority, Mohammed Yaseen, told the Associated Press (AP) news agency: "We have been negotiating with them (Twitter) until last night, but they did not agree to remove the stuff, so we had to block it.
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