Harris County law enforcement officials are calling a shooting at Atascocita High School on Jan. 31 an isolated incident. The 16-year-old Atascocita High School student shot after school on Thursday was buying marijuana from the 17-year-old who opened fire on him, Harris County Sheriff Ed Gonzalez said Friday morning.

According to ABC 13, Mikael Neciosup, 17, was arrested and charged with aggravated assault. Neciosup is also an Atascocita High School student, school officials confirmed. The shooting happened Jan. 31 just before 6:30 p.m. Authorities arrived within minutes after an 11th grade student was shot behind the cafeteria parking lot. The victim was injured in his foot and hip, but is expected to recover.

Officials said Neciosup shot the victim while selling a "small amount of marijuana" to him after the victim tried to take the drugs without paying. Authorities also confirmed that Neciosup was seen in Snapchat videos appearing to reference the shooting and boasting about it.

Gonzalez said he believes it was an isolated incident.

"The 16-year-old was taken to an area hospital just as a precaution and basic treatment," Gonzalez said.

Humble ISD released the following statement Jan. 31 concerning the incident:

"An 11th grade male AHS student was shot in the AHS parking lot tonight at approximately 6:20 p.m. The 11th grader is expected to recover. He was wounded in the foot and hip. At time of transport, he was talking and alert."

Extra security was on campus Feb. 1 in the wake of the shooting.

At the time of the incident, there were about 85 students on the campus for athletic and fine arts activities. Students were kept safe in their areas until released by police, as a routine procedure. Neciosup was arrested on North Houston Avenue around 10:30 p.m. Jan. 31 when a Humble officer pulled him over during a routine traffic stop.

During the traffic stop, officials told ABC13 the teen had the gun, which police took. The sheriff said more people could face charges in this shooting, and school officials said both teens will be disciplined.