PORTLAND, Ore. - Police in Oregon are investigating a weekend port-a-potty explosion that injured a woman and sparked the evacuation of a crowded adjacent ballfield and also are looking for links to another blast nearby, authorities said on Monday.
Authorities said a Washington state woman was struck in the back of her head when a "small explosion" went off after she entered a portable toilet at the International School of Beaverton in the Portland suburb of Aloha on Saturday.
"The entire area was evacuated to safeguard crowds attending a regional softball tournament at the school," the Washington County Sheriff's Office said in a statement.
The injured woman, Karikaye Finch, 40, was treated and released from a nearby hospital. She could not be reached for comment.
Sheriff's spokesman Sergeant Bob Ray would not comment on a possible suspect but said more information could be released soon and that deputies were continuing to interview the victim and witnesses.
Police determined that the explosion was likely caused by a homemade device using chemicals available at any grocery store.
A search of the school and park by the Portland Police Bureau Bomb Squad found no more devices at the school or adjacent park, which was reopened a few hours after the incident.
But police received a call shortly after they reopened the park about an explosion in a mailbox a quarter mile from the school that caused minor damage from a similar device.
"Investigating deputies believe these two incidents are related," the release said.