When you see someone in trouble, usually your first instinct is to go and help them, but officials say in some situations that's not the best thing to do.
On Sunday The Reno Fire Department rescued three people from the Truckee River near the Lake Street Bridge in downtown Reno.
They say a girl fell in, her friend tried to save her but cramped up because of hypothermia. A man then jumped in to try to save them both.
The Reno Fire Department had to rescue all three of them from the river.
No one was transferred for injuries but all three were treated on scene for hypothermia.
Officials say this incident serves as a reminder that it's best to call 911 and be patient during a situation like that, unless you are properly trained and have the proper gear to perform a rescue.
Officials also want to remind people to have a personal flotation device before hitting the water, stay hydrated when you're in the hot sun, bring a friend, and leave the alcohol at home.
