An “improvised explosive device” was found in the playground of an elementary school in Montana in the United States, authorities said. 

No one was injured following the device’s discovery on Tuesday at the Rossiter Elementary school in the state’s capital, Helena, which has population of about 30,000.

The device, which was found in the playground of the school, located in a residential neighborhood just north of the city’s centre, had already exploded before students or faculty arrived at school, authorities said. 

Undersheriff Jason Grimmis said the device included a soda bottle wrapped with duct tape.

“We don’t know what time this thing exploded,” Grimmis said, according to the Independent Record news site. “But what I do know is it did not explode while there was

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