Serial arsonist? 5 fires set at downtown Renton businesses in past 3 weeks (VIDEO)

RENTON -- Renton business owners are on alert after learning they were targeted by an arsonist. Fire officials say they have reason to believe the fire-starter isn't new to the area.

Investigators say there's been a total of five fires set intentionally in the downtown area. The first fire was set three weeks ago in the 100 block of south Third Street, with the most recent fire just blocks away, near Renton High School.

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Right now police have no suspects but they say the best thing you can do is be alert. And if you see anything suspicious, contact police.