(Reuters) - Four days after superstorm Sandy smashed into the U.S. Northeast, rescuers on Friday were still discovering the extent of the death and devastation in New York and the New Jersey shore, and anger mounted over gasoline shortages, power outages and waits for relief supplies.

The total killed in one of the biggest storms to hit the United States jumped by a third on Thursday, to 98. In New York City, 40 people have been found dead, half of them in Staten Island, which was overrun by a wall of water on Monday.

Among the dead in Staten Island were two brothers, aged 2 and 4, who were swept from their mother's arms after her car stalled in rising flood waters. Their bodies were found near each other in a marshy area on Thursday.

U.S. Secretary of Homeland Security Janet Napolitano and Federal Emergency Management Agency Deputy Administrator Richard Serino planned to visit Staten Island on Friday amid angry claims by some survivors that the borough had been ignored.

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