Family members working on ways to make a fun announcement of a child’s gender for social media inadvertently created a pipe bomb.

The explosion sent metal shrapnel flying and striking a woman who was standing with family members about 45 feet away. She was killed instantly by a piece that struck her in the head

Authorities on Monday released the name of a woman killed after she was struck by debris during a gender reveal announcement Saturday in Knoxville.

The woman was identified as 56-year-old Pamela Kreimeyer in a news release Monday from the Marion County Sheriff’s Office.

“Members of the Kreimeyer family were experimenting with different types of explosive material on Friday and Saturday,” the news release said. Six people, including Kreimeyer and the expectant mother, gathered Saturday and put gunpowder inside a homemade stand that was welded to a metal base.

They put a piece of wood on top of the gunpowder and some colored powder on top of that. The stand had a hole drilled in the side for a fuse.

Finally, tape was wrapped over the top of the assembly. The idea was for the gunpowder to blast the colored powder indicating the gender out the top of the stand.

Sheriff Jason Sandholdt released a statement: “This family got together for what they thought was going to be a happy event with no intent for anyone to get hurt. What ended up happening was that Pamela Kreimeyer, a wife, mother and grandmother, was killed by a piece of metal where a metal stand, gunpowder and colored powder were involved. This is a reminder that anytime someone mixes these things there is a high potential for serious injury or death; please do not take these unnecessary risks. My condolences go out to the family.”