At least four people were killed Wednesday when tornadoes hit the region around Springfield, Massachusetts, CNN reported.
At least two tornadoes cut a 60-kilometre swathe in the western and central parts of the state, causing severe damage. Some 60,000 households were without power, the report said.
State Governor Patrick Deval called a state of emergency and 1,000 troops of the National Guard were mobilized to help in the rescue and recovery work, dpa reported.
Deval said the death toll could still rise. Two weeks ago, more than 140 people were killed by a tornado in the city of Joplin, Missouri.