Portland Police say pipe bomb caused Sunday boom

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A pipe bomb was the likely source of a mysterious “loud explosion” late Sunday night in Portland that was heard in Battle Ground, Felida and as far away as the Gifford Pinchot National Forest.

About 20 Vancouver residents tagged their location on an online map of those who say they heard the 8 p.m. explosion that circulated the Web today.

Initial attempts by Portland police and fire personnel to identify the cause of the explosion were unsuccessful.

But investigators today discovered a large pipe bomb in Powers Marine Park that appeared to have gone off. They believe the sound was amplified because of the bomb’s placement near the river and low cloud cover.

There were no injuries or property damage reported, according to a press release from the Portland Police Bureau.

An investigation is ongoing.