NASHUA – Two young children were injured, one critically, at a local farm Sunday afternoon when a gust of wind lifted an inflatable bounce house they had climbed into and blew it about 40-50 feet.

Deputy Nashua Fire Chief Mike O’Brien said the children are both boys, believed to be ages 3 and 2.

They had apparently entered the bounce house, which was set up near the main barn at Sullivan Farm on Coburn Avenue.

O’Brien said one of the boys suffered serious injuries and was flown by medical helicopter to Tufts Medical center in Boston.

The other child was taken by American Medical Response ambulance to St. Joseph Hospital in Nashua for treatment of injuries that were believed to be serious but not life-threatening.

The accident happened early Sunday afternoon as dozens of visitors to the farm were browsing the retail stand, walking on the trails or were out picking apples.

O’Brien said witnesses reported the bounce house, which one employee said had been inflated in order to dry out the inside, suddenly went airborne, cleared a roughly 10-12 foot high fence and crashed to the ground between two apple trees about 40-50 feet from where it took off.

Multiple Nashua police, fire and ambulance units were dispatched to the scene after calls came in reporting the possibility of several people injured in an accident at the farm.

The boy who was flown to Boston was stabilized by paramedics at the scene, then rushed to the Nashua Airport, which is less than a mile away from the scene, to meet the helicopter.

Officials roped off the area around the spot where the deflated bounce house landed as police and fire investigators talked with witnesses and began collecting information on the incident.

The accident comes less than 24 hours after a tragedy at a farm in Maine claimed the life of a teenage girl and injured nearly two dozen others.

Cassidy Charette of Oakland, Maine, was killed Saturday night when a hayride overturned at Harvest Hill Farm in Mechanic Falls, Maine, according to news reports.

In Nashua, it wasn’t immediately clear whether the bounce house was open for use at the time of the accident. O’Brien said the two injured boys were the only people inside it when it took off.

He said officials expect to learn more details as they conduct the ongoing investigation.

Sullivan Farm, a 50-acre working farm, is currently operated by third-generation owner Kathy Sullivan Williams.

A popular seasonal destination, the farm also hosts the Salvation Army of Nashua’s annual Applefest, the agency’s major fundraiser that was held this year in September but had previously taken place over Columbus Day weekend.

Dean Shalhoup can be reached at 594-6443 or dshalhoup@nashuatelegraph.com. Also, follow Shalhoup on Twitter (@Telegraph_DeanS).