YUCAIPA (CBSLA.com) — Someone has been setting off chemical bombs in yards and mailboxes in Yucaipa.

In the past few days, nine pressure bomb explosions have been reported in the area.

Although no one has been injured, police report the acid bombs create a very dangerous situation.

“The pressure bombs can cause extensive injuries, possibly death,” said Sgt. Fred Gonzalez from the San Bernardino County Sheriff’s Department.

Gonzalez confirmed the chemical bombs are produced in plastic bottles with certain household items.

“Unfortunately, those things are all over the Internet. If anyone wants to look it up, it’s there,” he said.

On Tuesday, a 2-liter bottle exploded across the street from Karen Weaver’s home.

“(It) sounds like a gunshot. It’s really loud,” she said.

Weaver said the incidents seem to be random.

“I think it’s just kids being kids. They have nothing else better to do,” she said.