Emergency responders rushed to the scene of a Quinceañera party in San Francisco to treat 14 people, all of whom were then taken to the hospital in "moderate condition" for ingesting an unknown substance.
Of the 14 people, seven are minors. One 9-year-old is in critical condition. Police ruled out a HAZMAT situation, and sources said that it seemed as if a "watermelon candy substance" could be to blame.
The birthday celebration was being held at the Women's Building, where several community and social service events are held. The San Francisco Fire Department asked that people try and avoid that corridor of 18th Street and Valencia.
People taken to the hospital reported heart palipitations, rashes and shortness of breath, according to officials. One woman leaving the building told NBC Bay Area reporter Christie Smith that those who got sick had a foamy-type substance coming from their mouth.
"It appears this is a candy substance, but that has to be vetted and verified," said Jonathan Baxter of the San Francisco Fire Department.
Anyone who knows anything or has any symptoms is asked to call the police.