One of the four victims of the Friday shooting near the Rosemary Anderson High School in Portland, Oregon, is in critical condition, while two others are in fair condition and one was treated where the incident happened.

CNN identifies the critically wounded as 16-year-old Taylor Zimmers, while those in fair condition are 20-year-old David Jackson-Liday and 17-year-old Labraye Franklin. The one treated at the shooting scene is a 17-year-old girl.

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Authorities are looking for the gunman, who immediately left the crime scene with two men. The three are still missing, said Pete Simpson of the Portland Police Bureau, reports Reuters.

The shooter is described to be in his late teens or early 20s. He fired at the victims, who are connected with the school as students or job trainees, at 12:15 p.m. The school, which has about 200 at-risk students who are either expelled, drop outs or homeless, locked down the campus temporarily, but has resumed classes.

Simpson said the gunman is possibly a member of a gang. He added that prior to the shooting, there was an argument.

A student who witnessed the shooting said that three of the victims sought safety in a school building. One of them was holding his stomach, gave out a name and then fell on the ground.

The three who were driven to the Legacy Emanuel Medical Center are breathing, conscious and talking, the police officer said.

It wasn't just Rosemary Anderson that locked down its campus after the shooting. The nearby Jefferson High School and Portland Community College likewise closed their campuses for a few hours.

Portland Mayor Charlie Hayes, who pointed out that the community has been striving to veer away from its reputation as an area of gang violence, said the incident is a "bad day" for the neighborhood. He added that while the city hasn't totally erased its gang problem, it has made a lot of progress the past few years.

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