A bomb threat prompted the evacuation of several Douglas County parks, including one in which people were attending a Jonatha Brooke concert.

ROSEBURG — A bomb threat prompted the evacuation of several Douglas County parks, including one in which people were attending a Jonatha Brooke concert.

The singer-songwriter left the stage at Stewart Park an hour into her performance Tuesday night. A concert official took the microphone and asked people to leave in an orderly fashion, which they did.

“There were 15 to 20 seconds where you could have heard a pin drop in that park,” said Sgt. Aaron Dunbar of the Roseburg Police Department. “It was really like a punch in the stomach, from the looks on the performers' faces to the look of the people in the crowd.”

According to Roseburg police, a man called 911 to report that a bomb inside a cooler would detonate in 17 minutes if the park wasn't cleared. The caller did not specify the park.

Besides Stewart Park, authorities evacuated Riverbend Park in Winston and all parks in Sutherlin.

No bomb was found and Roseburg police said Wednesday they had no suspects.

Law enforcement officers from the Oregon State Police and the Douglas County sheriff's office helped Roseburg police evacuate 3,000 to 3,500 people, Dunbar said.

He said concertgoers approached him 10 minutes into the evacuation, saying they had gathered $400 to offer as a reward for information leading to an arrest.

On her Web site, Brooke described the incident as a “crushing disappointment” and a “blow to the innocence” of the families who attended.

“Shame on the person who did this,” she added. “Shame on you. You lose.”