Al Jazeera's signal is being disrupted in "unprecedented ways" as it covers the Egyptian revolution, the New York Times' Brian Stelter reports."We have been working round the clock to make sure we are broadcasting on alternative frequencies," an Al Jazeera spokesman said in a statement to the Times. "Clearly there are powers that do not want our important images pushing for democracy and reform to be seen by the public." It was not immediately clear exactly how the signal is being disrupted, or if the Egyptian government was behind the disruptions.