Crews work the scene of a deck collapse on Friday in Rockville. Credit: via Pete Piringer

Three people were trapped — including two who were injured — when a deck collapsed on Friday afternoon in Rockville, according to fire and rescue services.

The three people were on the deck at a home on Adrian Street when it collapsed around 3:45 p.m., according to Montgomery County Fire and Rescue Services Chief Scott Goldstein.

Two people ended up trapped under the collapsed structure, while one was trapped on top, he said in a video posted to Twitter. Two were taken to a hospital with non-life threatening injuries.

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It’s not clear what caused the deck to collapse, Goldstein said, but it appears the deck was supported in part by the house, and became separated on that side.

“Very lucky,” Goldstein said in the video. “This is a tall deck, that could have been significant had that landed on them or had an entrapment situation.”

The county’s Fire and Rescue Services has been promoting deck safety this week after one collapsed in Germantown on Monday, sending six people to the hospital.

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It is believed the cause of that incident was similar to Friday’s: the deck disconnected from the home, according to officials.

Fire and Rescue Services recommends regular inspections and to avoid large gatherings on top of decks.

In Friday’s video, Goldstein reiterated those recommendations.

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“As you go about the holiday weekend outside in nice weather, make sure that you don’t overload your deck or get too many people on top of that deck,” he said. “Make sure if anything is loose, wobbling or creaking, those are early warning signs to the dangers at hand.”