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Excited children run though water as the fountains are turned on at Georgetown Waterfront Park in Washington, on Wednesday, June 20, 2012. Temperatures across the Northeast are expected to approach triple digits. (AP Photo/Jacquelyn Martin)

Northeast heat wave

The second day of a heat wave blanketed the U.S. mid-Atlantic and Northeast on Thursday, June 21, sparking power cuts in New York City and forcing utilities across the region to ask customers to conserve electricity.