As many as 10 people were killed and 20 injured when a shooter opened fire at Umpqua Community College Thursday in southern Oregon, according to Oregon State Police.

The shooter was downed, according to authorities, but his condition was not immediately clear. Police told KGW-TV that seven to 10 people were dead in the shooting spree.

Roseburg Police Sgt. Aaron Dunbar told USA TODAY that the incident was contained to one classroom on the sprawling campus.

Six agencies—the Douglas County Sheriff’s Department, Oregon State Police, Bureau of Land Management officers as well as police officers from Roseburg, Sutherlin, and Winston — responded to the scene after getting a rush of 911 calls reporting the mass casualty shooting.

Police received a call of an active shooter in a classroom at the college at 10:30 a.m., local time,  according to the Douglas County Sheriff’s Office

“Active shooter at UCC. Please stay away from the area,”  Fire District No. 2 that serves Douglas County said on Twitter.

Jared Norman, a nursing student at UCC, told The (Roseburg) News-Review that he heard shots “and then everyone was running.”

He was initially locked down in a cafeteria with 50 other students. “They’ve heard there is a shooting, but they don’t know what’s going on. And they’re scared,” he said.

“We locked our door and I went out to lock up the rest rooms and could hear four shots from the front of campus,” UCC Foundation Executive Director Dennis O’Neill told the newspaper.

The News-Review also reported that an automated phone call went out to parents at Roseburg School District at 11:42 a.m. PT., informing them of the shooting.

Sara Mattison, a reporter for KVAL television, said she could see a female student covered in blood get into a car and leave the campus. Mattison also saw parents crying and looking for their children at the campus.

Sean Clark, a spokesman for Roseburg Health Care System, told KATU television that the hospital called in extra doctors and other staffers from other shifts to care for wounded in the attack.

The federal Bureau of Alcohol, Tobacco, Firearms and Explosives tweeted that it had special agents at the college and was sending additional agents, as well as a K-9 team, to the scene.

The college, 6 miles north of Roseburg, Ore., normally has 3,000 full-time students and 16,000 part-timers.  Authorities quickly spread the word and called on residents and students not to go to the campus.

According to the Oregon State Police scanner traffic, authorities were preparing to release students from their classrooms, but asked that they be “patted down” before they were allowed to leave campus.

The college, established in 1964, has 16 buildings, and the campus includes a track, tennis courts, an outdoor pool and a vineyard.

The 100-acre campus is situated on verdant pasture along the North Umpqua River. In 2010, the school started construction on a $6.7 million viticulture building that now houses the Southern Oregon Wine Institute, which is a state of the art wine production and teaching facility.

Contributing: Aamer Madhani, Greg Toppo