A 12-year-old boy using gasoline to set plastic army figurines on fire in

was seriously burned when he was engulfed by fuel vapors Thursday night.

A police officer driving past a home in the 4800 block of Southwest 160th Avenue saw the boy on fire in the driveway around 8 p.m., said Brian Barker, a

spokesman.

Bystanders tried to extinguish the flames, possibly using a garden hose.

The boy was taken to the burn center at Legacy Emanuel Medical Center with serious burns over a significant portion of his body.

"More than likely, the vapors from the gasoline ignited, and his clothes caught on fire," Barker said. "It's not just the liquid that's flammable, it's the vapors in the air."

The incident caused no damage to any buildings.

Less than an hour earlier, at 7 p.m., a 15-year-old boy sustained minor burns on his arms while trying to make a smoke bomb in his family's kitchen on Northwest Lilium Drive in

.

The homemade bomb caught fire when the boy heated it on the stove, causing minor damage to the kitchen, Barker said.

The boy's family took him to the hospital.

"Kids are out of school, and maybe they have some extra time on their hands. We have two different teenagers in two different parts of town getting burned," Barker said. "It's an important reminder to parents."

Thursday was the last day of school for the Beaverton School District.

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