An improvised explosive device detonated on the playground of a Montana elementary school Tuesday, authorities said.

No one was injured, according to the Lewis and Clark County Sheriff's Office, but students at the Rossiter Elementary School in Helena were evacuated.
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Silent:

Rossiter Elementary School [link to www.cnn.com (secure)]

Helena [link to www.cnn.com (secure)]

IED [link to www.cnn.com (secure)]