Police responded shortly after 8 a.m. today to reports of a shooting at Reynolds High School in Troutdale, Oregon.
Details are still coming in, but a number of emergency vehicles are parked near the school, while a Multnomah County Sheriff's office spokesman confirms they have responded to calls about an active shooter.
Approximately 60 police and sheriff's units are on scene, according to KOIN, as well as 19 medical personnel.
One student has Tweeted that the school is in lockdown, while another says he heard gunfire.
The wife of a vice principal, meanwhile, says she received a text message from her husband that also verified the presence of an active shooter somewhere inside the school.
At this time, it's believed that multiple injuries have taken place, but no deaths have been reported.
Troutdale is located about 12 miles northeast of Portland.
UPDATE: About an hour after the shooting, Oregon State Police say the area is secure.
They also confirm that one student is dead, though they have not yet released his or her identity.
The shooter has also been killed.
"Today is a very tragic day for the city of Troutdale," said police chief Scott Anderson.