Another school shooting occurred in the US after a middle school student opened fire in his gym with a shotgun and critically wounded two students in Roswell, New Mexico.

According to ABC News, A 13-year-old girl and a 12-year-old boy were injured. They were just "simply sitting in their gym waiting to go to class," said New Mexico Gov. Susana Martinez. The school shooting occurred at the Berrendo Middle School.

The Eastern New Mexico Medical Center confirmed it treated two patients, who were then air lifted to the University Medical Center in Lubbock, Texas.

A spokesperson for UMC said the 12 year old boy is out of surgery and is listed in critical condition. The 13 year old girl is also being treated at the hospital and is listed in serious condition, according to the spokesperson. A school staff member suffered a minor injury and declined treatment.

The names of the school shooting victims have not been released.

Odiee Carranza, an eighth grade student, told journalists that a boy bumped into her as he rushed toward the gym and apologized to her. When the boy entered the gym, Carranza said she saw him pull a gun out of a band instrument case and began shooting.

She said he shot another boy twice in the face and shot a girl in the arm.

"Then he shot up in the sky, then dropped the gun, and then some teacher grabbed the kid that had the gun".

Authorities said the weapon was a shotgun and the shooter was a 12-year-old seventh grader.

According to ABC News, The governor said a school staffer and an off-duty New Mexico State Police lieutenant who was dropping his child off at the school were instrumental in helping to end the active shooter situation before more people were injured.

New Mexico State Police Chief Pete Kassetas said by the time his deputies arrived around 8: 11 a.m., "the weapon, which we believe is a shotgun, was laid on the ground."

Police Chief Pete Kassetas did not disclose a possible motive, but said investigators are "looking at social media outlets and the different forms of communication these kids use to talk to each other."

After the scene was secure, students were taken from the school to Roswell Mall where police said parents will be allowed to pick up their children. Authorities asked parents to stay away from the school during the investigation.

According to ABC News, This incident is the latest school shooting one month after a gunman open fire at Arapahoe High School in Colorado.