ALOHA, Ore. -- A woman was injured at a park near an Aloha school Saturday after a suspicious device exploded in a portable restroom, police said. Two other devices in nearby mailboxes exploded hours later.

The first blast was reported around 12:30 p.m. at Arnold Park near the International School of Beaverton, 17770 SW Blanton St. in Aloha.

The victim, 40-year-old Kari Finch of Spokane, injured the back of her head while inside the port-a-potty, according to Sgt. Vance Stimler of the Washington County Sheriff's Office. She was taken to the hospital with non-life-threatening injuries.

There was no wick, there was no smell, so it had to be something that was chemically reactive, she said. I just happened to be at the wrong place at the wrong time.

Finch said doctors had to put two staples in her head to help mend the injury.

The Portland Police Bureau bomb squad investigated and searched for additional suspicious devices.

The park was reopened around 3 p.m., but about an hour later, there was another explosion in a nearby mailbox. Then, later, a third incident happened in another mailbox at Southwest Davis Road.

No one was hurt in those explosions. Stimler said officials are still searching for a suspect.

Bomb squad officials said the explosive devices were likely homemade, using chemicals that are available at grocery stores.

They believe the three incidents were related, Stimler said.

Finch said she saw a teenage boy leave the port-a-potty just before the blast.

The thing I'm mad about is that he had a moment, he had a moment to tell me don't go in there, it's horrible in there, and that's all it would have taken, she said.

A softball tournament was happening when the first device was found. Around 200 people were evacuated and the tournament was postponed, Stimler said.

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