Richland police are warning residents after two chemical bombs exploded on separate properties in south Richland.

No one was hurt by the explosions, said Officer Erica Tungesvik.

There are no suspects and no known connections between the two victims, she said.

The bombs were found Friday on the driveway and front lawn of homes in the 200 block of Timmerman Drive and 1500 block of Tieton Court, Tungesvik said.

Plastic bottles were used to make the devices, along with a form of acid that created a reaction inside the bottle, causing it to explode, she said.

In these particular cases, there were no flames involved with the explosion.

The victims also did not know the bombs were on their properties until after they exploded, she said.

Police say people should be cautious if they see a suspicious device.

"These bombs are very dangerous," Tungesvik said. "Don't touch it. Call us."

Even if a bomb has exploded, it still can be dangerous because the chemicals used still could be on or around the plastic.

The chemical bombs can be made with any type and size of plastic bottle.

It may be hard to tell if a plastic bottle is just tossed trash or a chemical bomb, but officers say if it's a bomb, the bottle may swell before it explodes or there may be some gases inside the bottle, making it difficult to see inside.

If any of those conditions are spotted, people need to immediately back away from the bottle and call police. If there's a doubt, they should leave the bottle alone and call police.

Anyone with information about the two chemical bombs that exploded Friday is asked to call Richland police at 628-0333.