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Postal Service Mailbox Explosion Possibly Caused By Pipe Bomb

ARVADA, Colo. (CBS4) - Inspectors with the U.S. Postal Service and the ATF have joined Arvada police in an investigation into how a Postal Service mailbox was destroyed overnight.

The mailbox was located in a parking lot on the 9500 block of Ralston Road, and police said it's possible a pipe bomb caused the damage.

Arvada police said several people called about a suspicious noise at 2:30 a.m. Police responded but were unable to determine what the calls were about because they came from several different areas.

At 7 a.m. another person called police and alerted them to the exploded mailbox, which is in front of a building that formerly housed a Safeway grocery store.

Investigators put numerous markers down on the concrete where debris surrounded the mailbox as part of their investigation.

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