BAKERSFIELD, Calif. -- A water slide party has been identified as the source of an E. coli outbreak, according to the Kern County Health Department.

In a news conference on Monday, county health officials announced that two children were already sick when they attended the party and sickened other children, ABC23 reported.

Officials said they are still trying to determine how the original two children got sick.

Three children have been diagnosed with the illness while six children and one adult continue to be monitored, according to health department officials.

Officials maintain that the outbreak was contained to a circle of friends and acquaintances.