One student was killed on Tuesday morning after a gunman opened fire at Reynolds High in Troutdale, Oregon. According to law enforcement officials, the situation at the suburban Portland school is now stabilized, and the gunman is also deceased. The shooting also injured a teacher, who was treated at the scene. 

According to a local CBS affiliate, a student at the school relayed to his parents that the gunman opened fire in the gymnasium towards the start of school on Tuesday, but law enforcement officials haven't confirmed that. SWAT officers were still moving through the school, evacuating students, hours after the shooting began. Reynolds is a large school of more than 2,000 students. 

The Associated Press spoke with some students who were evacuated from the building: 

Freshman Daniel DeLong, 15, said while waiting after the shooting that he saw a physical education teacher at the school with a bloodied shirt.

"I'm a little shaken up," DeLong said. "I'm just worried."

He said he was texting friends to make sure they were all OK.

"It just, like, happened so fast, you know?" he said.

The deceased student and the gunman have not yet been identified. According to police, the shooter used a rifle. 

Update 3:29 p.m.: According to the Associated Press, law enforcement officials believe they know the identity of the lone gunman in Tuesday's shooting, but they're not ready to release the name. Officials are in the process of contacting the families of both deceased individuals. 

Update 5:45 p.m.: CNN, citing multiple law enforcement officials, reports that the gunman was a student, and that he died of apparent self-inflicted wounds.