Fifteen horses, some of which suffered superficial injuries, have been rescued from a Massachusetts barn after a portion of the roof collapsed under the weight of snow.

The barn's owner, Ethelene Devers, says the collapse was discovered at about 7 a.m. Monday when several people went to feed the horses and clean the barn and riding arena.

There were no human injuries.

The horses trapped inside were sedated and rescued by Norwell firefighters and trainers.

Many of the horses were trapped in an area where the roof did not collapse.

Devers said snow had been removed from an older portion of the roof, but the collapse occurred in a newer area.

Two horses died in a barn roof collapse in Westford last month.