PORTLAND, Ore. – The Latest on an armed student who was tackled at a Portland, Oregon, school (all times local):

3 p.m.

A high school senior who authorities say brought a shotgun to a Portland, Oregon, school but was tackled by a security guard before anyone was hurt has pleaded not guilty to gun-related charges.

Angel Granados-Diaz entered the plea Monday during a brief hearing to one felony and three misdemeanours.

Granados-Diaz turned 19 in jail on Monday as classes resumed at Parkrose High School.

Authorities say he was arrested Friday at Parkrose after former University of Oregon football star Keanon Lowe wrestled the gun away from him.

Lowe works at the school as head football and track coach and as a security guard.

No one was injured in the incident. Police are still trying to determine if any shots were fired.

____

11:14 a.m.

A former University of Oregon football star says he had seconds to react when a student armed with a shotgun entered a classroom at a Portland high school.

Keanon Lowe, who now works as a coach at Parkrose High School, tells Good Morning America that he wrestled the student for the gun Friday as other students ran screaming from the room.

The suspect, 18-year-old Angel Granados Diaz, was expected to be in court Monday on several firearms charges.

Court papers don’t list an attorney for him.

No one was injured in the incident. Police are still trying to determine if any shots were fired.

Lowe, who is also a school security guard, says he was in the classroom to take a student to the office when Diaz walked in.