SALIDA, Colo. -- A black bear attack at a camp just south of Poncho Springs, Colo., has forced the closure of the camp because it is the second such attack in nine days.

A black bear clawed through a tent at the Packard High Adventure Base and attacked a 17-year-old Paul Marusak (pictured, right) Thursday morning, authorities said. On July 24, Scout leader Vicki Myhnier, 44, was pulled from her tent by a bear that bit her hand and arm.

Marusak suffered a bruised back and minor injuries. He was sleeping in the same tent where Myhnier was attacked, camp director John Sallie said.

In both instances, the bear entered the tent in the early morning hours and was chased off by Boy Scout leaders who responded when the victims screamed for help, wildlife officials said.

Wildlife officials on Wednesday shot and killed a bear that they believed attacked Myhnier but said Thursday that they were no longer certain they got the right animal.

"It was captured right in the middle of the campground. We felt it was likely this bear," Division of Wildlife spokesman Todd Malmsbury said. "Given the attack last night, we can no longer be sure it was the bear."

The decision to close the camp was made by the Chaffee County Sheriff's Office and the Division of Wildlife. Sallie said that the camp closed after the first attack but reopened immediately because authorities said it was safe.

Campers were taken to St. Joseph's Catholic Church in Salida, where they will stay through the end of the week to finish up their activities.

The 31-year-old camp, about 160 miles southwest of Denver, had never had a bear attack before this year, he said. The camp takes teenage boys rappelling, whitewater rafting, mountain biking and hiking.

Tom Beck, one of North America's foremost black bear biologisits, said that bears that injure people are usually those that have become habituated to human food and trash.

"Once bears find human food and trash, they keep coming back because it's nutritious, digestable and easy to obtain," Beck said. "If they keep finding the food, they'll keep coming back for more and will eventually lose their natural wariness of people. It's in these situations when injuries to people are most likely to occur."

Thursday's bear attack was the third in the state this summer. A Colorado Springs boy chased a black bear from his campsite near Walsenburg last month after it bit him.

Bears have killed two people in Colorado in the last 100 years.