[9:32 p.m. ET] At least four people have been killed in the tornadoes that struck western Massachusetts on Wednesday, Massachusetts Gov. Deval Patrick said.

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[8:25 p.m. ET] Severe storms - including tornadoes - have left behind "many injuries" and extensive damage in western and central Massachusetts on Wednesday, Gov. Deval Patrick said.

Patrick also said he's received a report one person has died as as result of the storms. He said he has declared a state of emergency for Massachusetts and called up 1,000 National Guard members, who will be asked to help with cleanup and search-and-rescue operations.

"It's been particularly devastating in downtown Springfield," he said.

Patrick said he was asking school superintendents in affected communities to cancel Thursday classes so that rescue and recovery personnel could concentrate on cleanup.

The National Weather Service has said it received three reports of tornadoes in Massachusetts on Wednesday: at least one near Springfield; one near Palmer; and one near Sturbridge and Oxford.

Sandra Ahearn, a spokeswoman for the Western Massachusetts Electric Co., said 12,000 customers were without power in the utility's service area and that hard-hit areas might not have electricity until the end of the week.

[7:50 p.m. ET] Trained weather spotters reported a tornado near Sturbridge, Massachusetts, at 7:25 p.m. ET, bringing to at least three the number of tornadoes that have been reported in the state Wednesday, the National Weather Service said.

By 7:35 p.m., the suspected tornado was located near Oxford, Massachusetts, moving east at 30 mph.

[6:53 p.m. ET] Local law enforcement reported a tornado caused widespread damage near Palmer, Massachusetts, about 14 miles northeast of Springfield. The tornado was moving east at 35 mph, the National Weather Service said.

[4:51 p.m. ET] Witnesses reported a tornado near downtown Springfield, Massachusetts, on Wednesday as heavy thunderstorms swept through western Massachusetts, according to the National Weather Service.

Police and amateur radio operators said tornadoes were spotted in a Springfield neighborhood and within a half-mile of downtown, according to a warning put out by the Weather Service. No confirmation of damage or injuries was immediately known, however.

Springfield is about 90 miles west of Boston.