A rare October snowstorm has hit the US East Coast, killing at least three people, while leaving 2.3 million others without electricity. At least three deaths were attributed to the Sunday storm in Pennsylvania, Massachusetts and Connecticut, The New York Times reported. One person died in Connecticut in a traffic accident caused by icy road conditions. In Massachusetts, a fallen power line electrocuted a man. Similarly, a tree that fell under the weight of snow killed another in Pennsylvania. Residents in many towns across the Northeast found themselves without power after an unusual autumn storm dumped record amounts of snow. The 750,000 who lost power in Connecticut broke a state record set when Hurricane Irene hit in August. "If you are without power, you should expect to be without power for a prolonged period of time," Gov. Dannel P. Malloy said. This comes while the governors in US state of New Jersey, Massachusetts and Connecticut have declared states of emergency. Flight delays were reported in Philadelphia International Airport and About 950 flights had been canceled at the three airports.