It was determined the woman died after the gender reveal caused an explosion, the Des Moines Register reported. Debris from the explosion flew through the air, reportedly hitting the victim and severely wounding her.
Officials did not release further information about the incident. However, gender-reveal parties often make headlines for their disastrous outcomes.
Another gender-reveal party that resulted in an explosion was in April 2017, when a U.S. Border Patrol agent shot a rifle at the highly explosive substance Tannerite near Green Valley, Ariz., sparking the Sawmill Fire that caused more than $8 million worth of damage.
The Associated Press contributed to this report.