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PORTLAND - A reward was offered for help in the mysterious fire that destroyed the Thunderbird on the Beach hotel complex on Hayden Island.

On Thursday, police said a reward of up to $1,000 was offered for help in the case, since arson is a possible cause.

No one was hurt in the suspicious fire that broke out early the Sunday morning of the Labor Day holiday weekend, and lit up the I-5 corridor over the Columbia River.

Your Pics: Jantzen Beach hotel fire

The fire caused $17 million in damage and destroyed five buildings of the complex, which has sat fenced off and vacant since 2005.

A representative with the Multnomah County Assessor's office said the owners of Thunderbird Hotel LLC owed $1.123,801.02 in back taxes.

A tipline for anyone with information was set up at 1-800-800-3855 - select option 2 at the first voice prompt, then option 3 at the second prompt. Officials from the federal bureau of Alcohol Tobacco and Firearms were in charge of the investigation.

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Crime Stoppers offered a cash reward of up to $1,000 for information, reported to Crime Stoppers, that leads to an arrest in this case, or any unsolved felony, and you can remain anonymous.

Leave a Crime Stoppers tip online or text CRIMES (274637) and in the subject line put 823HELP, followed by your tip, or call 503-823-HELP (4357) and leave your tip information.

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