Investigators are looking to pinpoint what caused a huge wind turbine blade to break off in Plymouth and experts say incidents like this are rare but not unheard of.

A broken blade and a lot of questions for those living near the wind turbines after a blade fell some 300 feet into a nearby Cranberry bog on Friday.

Northeastern University professor Nathan Post used to test tubines and after reviewing the footage says he thinks he can tell what happened.

“It appears from the footage that the blade detached at the root where the pitch bearing is,” he said.

“It’s something that the wind plant is going to of course do a root cause analysis on and figure on what went wrong here.”

Post says most turbines are inspected every six months to a year.

The company that owns it is now working on a

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