Some runners who participated in the Rock `n' Marathon in Las Vegas say water passed out during the race made them sick.

The Las Vegas Sun reports that health officials are investigating at least 10 claims of intestinal problems following the Sunday night marathon. They also have posted a survey to pinpoint a possible source for illness complaints that have been posted on Facebook.

Race organizers filled lined buckets or trash cans with hydrant water, which was used to fill cups offered to racers along the course.

Some runners complained that the water tasted odd or unclean.

Race organizers say the hydrant water was tested and found to be safe.

How about those trash cans?