One person was killed and four others injured when a gunman opened fire at a ZombiCon event on Saturday night.
Terrified revellers – many of whom were in fancy dress – ran screaming from the scene after shots were fired at the gathering in Fort Myers, Florida.
Police were today hunting the suspect as four people recovered from injuries which were not thought to be life-threatening.
Lieutenant Victor Medico told the News-Press: “There was a lot of witnesses down here, there were a lot of people taking pictures, videos with their cellphones.
"Anything that could help with this investigation would be greatly appreciated."
The annual event, in its ninth year, was expected to attract up to 20,000 people.
Organisers said they were “deeply saddened” at the news in a statement on Facebook.
The statement added: “We take the safety of our patrons very seriously and take precautions in hiring security and police officers for our annual event. Our prayers go out to the family members and individuals involved in the incident."
