Major emergency response as three booms and shakes are felt on New York's Roosevelt Island: Firefighters are urgently 'trying to find the source' as they probe 'manhole fires'
Fire crews were called to Main Street on the south of the Island around 6am
Residents as far away as Astoria over the East River heard the series of blasts
FDNY is investigating what caused the tremors amid power outages on the island
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