WOODSTOCK, Conn. -- A Connecticut summer camp has been asked to voluntarily shut down after E. coli was discovered in the camp's water supply.

Northeast Health District has requested that Camp Woodstock shut down after a preliminary test was positive for E. coli.

Camp May Close After E. Coli Discovery

Parents of students who recently attended the camp received a letter on Monday detailing the findings.

Fifth- and sixth-grade students from Highland Park School and Washington School attended the camp last week.

Manchester school officials told Eyewitness News that a group of students from Washington School was scheduled to begin the camp on Monday, but was turned around after the E. coli discovery.

School officials said no illnesses have yet been reported in connection with the discovery.

Symptoms of E. coli usually appear within two to four days after exposure, but can take as many as eight days to be evident.

A testing company returned to the camp on Monday and took four more tests, according to health officials. The results of those tests are due on Tuesday.

Inspectors from the state's Department of Health will also conduct an inspection of the camp's water system on Tuesday.

Northeast Health District said that if the camp fails to voluntarily shut down, it has full legal rights to order it to close.