CHELSEA, MASS. (WHDH) - Chelsea fire crews used a ladder truck to rescue three people from a third-floor window of a burning apartment building on Sunday morning.

Video from the scene on Congress Avenue showed the people being guided onto the apparatus. All three were taken to the hospital to be treated for smoke inhalation.

About a dozen people were displaced.

The cause of the fire remains under investigation.

No additional information was immediately available.

This is a developing news story; stay with 7NEWS on-air and online for the latest details.

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