Update 1:06 pm:
SWAT teams descended on an Oregon high school Tuesday after a gunman opened fire with a semiautomatic weapon, and the gunman has died, police said.
The Multnomah County Sheriff's department issued a statement saying the shooter was "confirmed deceased" and the situation was under control.
The shooting took place at Reynolds High School in Troutdale just as the school day was beginning, officials said.
"We are still checking the building," Sue Strickland, police records specialist for the Troutdale police, told USA TODAY. "We have about 40-50 units out there. We have several SWAT teams in the building right now and they are checking to make sure that they've got things under control. A semi-automatic weapon was used and there are injuries."
KGW-TV has a live stream of the situation available here.
Mayor Doug Daoust told MSNBC that gunshots were heard and students fled the building just as school was to begin. Students were evacuated from the school and later were released to their parents in a parking lot.
The school, which includes grades 9-12, has more than 2,800 students. Troutdale is an eastern suburb of Portland.
Contributing: Kevin Johnson
Update 12:23 pm:
Officials confirmed the shooter involved in an Oregon high school shooting is dead, reports KGW-TV in Portland.
Police are now securing the scene in Troutdale, Ore.
Police are responding to reports of a shooting at a high school in Troutdale, Ore., a Multnomah County Sheriff's Office spokesman said.
There were reports of shots fired at Reynolds High School. Portland's KGW-TV reported. A number of emergency vehicles have been staged near the school, and numerous police officers were on the scene.
Mayor Doug Daoust told MSNBC that shooting was heard, but that there were no immediate reports of injuries.
" Police officers from multiple cities are swarming" the area Daoust said. "A Lifeline helicopter has been called to the scene, but we don't know at this point if there are any injuries."