Massachusetts has closed 30 state-run pools while authorities investigate the suspected drowning of a 36-year-old woman whose body apparently floated unnoticed in a public pool for more than two days.

The body of Marie Joseph, 36, of Fall River was found at 10 p.m. Tuesday by teenagers who jumped the locked fence for an after-hours swim at the Vietnam Veteran's Memorial Pool in the city's Lafayette Park. Police said she was last seen in the pool Sunday at 1 p.m. with neighbors. The pool was open to the public Monday and Tuesday, but the 12-foot-deep end was closed because the water was cloudy.

The local Herald News carried a photo Tuesday showing swimmers on Monday.

Pool staffers were suspended, and Fall River's mayor said today that two city inspectors have been placed on paid leave, the Associated Press says.

What happened Sunday is not clear. A 9-year-old boy whom Joseph was watching at the pool told police she had an accident on a water slide. The boy said, "Marie unexpectedly slid down the slide, landing on top of him," Fall River Police Chief Daniel Racine said at a news conference Wednesday, the Boston Globe reported. "He further stated he believed Marie went under the water and did not surface."

Joseph's friends said they thought she had left the pool without them, and she was not reported missing. Autopsy results have not been released, but police said her death appeared to be from accidental drowning.

Today, a top state health official sought to reassure those who swam in the pool Monday and Tuesday that there was no health risk because of the chlorine in the water.

"Though it is disturbing to think of swimming in the pool while a body was there, there are no significant risks to it," said Lauren Smith, medical director of the Department of Public Health, the Herald News reports.