Kari Finch was in the portable restroom when a suspicious device exploded and caused her to injure the back of her head. The 40-year-old received two staples in her head as a result of the incident.
"There was no wick, there was no smell, so it had to be something that was chemically reactive," Finch told KGW. "I just happened to be at the wrong place at the wrong time."
After the park explosion, two other devices exploded in mailboxes in the area. According to Sgt. Vance Stimler of the Washington County Sheriff's Office, all of the explosions are believed to be connected.
"We don't know what their intention was. Whatever it was, it was reckless, and in this case, it caused injury to the victim. Now, we're looking for a suspect for assault," Stimler told KOIN.
Finch reported seeing a teenage boy exit the port-a-potty prior to the explosion.
"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," Finch said.
A softball tournament that was taking place in the park was halted so police could investigate the situation.