Firefighters are warning people to not leave plastic water bottles in cars during extreme heat.

They say leaving a plastic bottle of water in a hot car in direct sunlight can start a fire in just minutes.

In order for that to happen, firefighters say the bottle would have to be full.

Then, the water and plastic could create a magnifying effect, which could set the inside of the vehicle or a piece of plastic on fire.

Image Credit: Facebook / Idaho Power

Firefighters suggest putting bottled water in the trunk instead if it hasto be kept in the vehicle.