An 11-kilogram rock created this hole in resident Russ Carpenter's roof, as part of the shower of blasted rock and debris that descended upon the Lobird Trailer Park on Tuesday. (CBC)

Blasting work being done to extend Hamilton Boulevard in Whitehorse ended up damaging several homes in a nearby trailer court Tuesday night.

The Yukon Workers' Compensation Health and Safety Board is looking into the incident, in which a blast around 6:45 p.m. PT sent chunks of rock flying into the Lobird Trailer Court.

Rocks rained down on homes and vehicles, surprising unsuspecting families, some of whom reported seeing chunks the size of basketballs or larger.

"I heard something strike next door, the fence next door, and went, 'What was that?' And then all of a sudden, wham!" resident Russ Carpenter told CBC News on Wednesday.

A piece of rock weighing about 11 kilograms had crashed through the roof of Carpenter's house, landing in the living room. He and his wife Candace were in the house watching television when it happened.

"It was like an explosion in our house … we were covered in insulation," he said.

Morris Lamrock told CBC News that he was having dinner with neighbours when they heard an explosion, followed by the sound of something hitting their house.

"I could see rocks bigger than my head that were lying on the driveway of our neighbour's [house]," Lamrock said. "And I said, 'Have you put those there?' And he said, 'No, no. These just happened seconds ago.'"

Minister promises independent review

Officials looking into the blast said no one was injured.

Lamrock said trailer court residents called RCMP and the city, who offered little assistance to them.

But in the Yukon's legislative assembly, Community Services Minister Glenn Hart promised to have government officials talk to the trailer park residents.

"We are in a process of hiring an independent expert to come up and do an assessment of the situation, and provide us with an independent review of the procedures that were provided by the contractor. That contractor will have to abide by the recommendations from that review," Hart said during question period Wednesday.

"In addition, we will be taking the results of that review to the members of Lobird Trailer Park. We'll be out visiting those people in Lobird Trailer Park to check with them, advise them [of] what we're doing and advise them when this report will come in there and also to deal with any situations they may have a result of this incident."

Blasting suspended: compensation board

Mark Hill, a spokesman with the Workers' Compensation Health and Safety Board, said one of two companies involved in the Hamilton Boulevard blasting work is now under investigation.

"The director of occupational health and safety is himself on the scene as we speak, and has issued a stop work order related to the blasting on the project, and further has suspended the project's blasting permits until the investigation is complete," Hill said.

Blasting work to extend Hamilton Boulevard began earlier this year.