Two people were injured after an explosion at Punkin Chunkin Sunday, according to Delaware State Police.
A man and a woman were hurt when an air cannon, called a "Pumpkin Reaper," went off and launched large pieces of material from the cannon into the air, according to Delaware Online.
A 39-year-old woman, whose name has not been released, was struck in the head.
The woman was treated on the scene by Sussex County Paramedics and taken to Nanticoke Memorial Hospital.
She was then flown to another hospital, where she is currently listed in critical condition.
A 56-year-old man was also injured in the explosion. Delaware State Police said the man was taken to Nanticoke Memorial Hospital where he is being treated for non-life-threatening injuries.
A state police helicopter landed at the scene to help paramedics and multiple EMS crews.
Detectives are still working to determine what caused the material to fly from the cannon.
According to Delaware Online, this isn't the first incident at Punkin Chunkin.
In 2013, a former Punkin Chunkin volunteer who acted as a "spotter" to help determine how far pumpkins traveled from their machine, filed a lawsuit against the owner of Wheatley Farms Inc.
He claimed that Wheatley Farms Inc. and the Punkin Chunkin Association were liable for a spinal injury he suffered while volunteering. The lawsuit was dismissed in June 2015.
What is Punkin Chunkin?
Punkin Chunkin is a sport in which people create devices to see who can launch a pumpkin the longest distance.
The World Championship Punkin Chunkin is held annually in Delaware, usually in Bridgeville, where Sunday's incident occurred.