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An 18-year-old Michigan girl and her older brother were killed after a bonfire exploded at a party celebrating the teen's graduation.

MyFoxDetroit.com reports police say Savannah Blewett was building the bonfire in her backyard Saturday with the help of her 27-year-old brother, Chris. Chris Blewett doused the wood pile with gasoline and told his sister to light it. The resulting explosion killed both siblings.

"They've lost their whole family, so there's no future," Tom Blewett, the victims' uncle, told MyFoxDetroit.com.