The Arapahoe High School gunman had been deemed "not a high-level of threat" after shouting a death threat against his debate coach.
CENTENNIAL, Colo. - Students returned to classes at Arapahoe High School on Tuesday.
It was the first time classes have been held since the deadly shooting on December 13.
“[I] thought it’d be a lot harder coming in but, uh, I noticed, like, all the teachers had, like, a Warrior Arapahoe shirts on and that really made it a lot, like, made me feel more at home,” said Nick Farmen, a senior.
Farmen said he was in psychology class and huddled with his classmates when the shooting began on Dec. 13.
“Having everyone around [today] and having everyone there kind of makes it easier on us to be able to get back to our normal schedule," Farmen told 7NEWS Reporter Tyler Lopez.
Returning students also found encouraging notes posted on their lockers.
Officials have increased police presence at the school, Principal Natalie Pramenko said.
"The safety and security of our students and staff remains our highest priority at Arapahoe High
School," Pramenko said in a letter to parents.
Finals that were postponed due to the school closure will be held Wednesday and Thursday, but Pramenko said finals are optional and are for grade improvement only. Students who do not take finals will keep the grade they earned before exams. Students who take exams and see their grade drops, will be able to maintain the original grade prior to the final exam.
The shooting left two people dead -- student Claire Davis and the gunman, another student.
Three shots were fired in a hallway and two shots were fired in the school library. Pramenko said work is underway to remodel the library.
"The library was cordoned off… they’re remodeling it," Farmen said Tuesday. "I’m hopeful for the future there.”
Second semester will start Friday at the school with an all‐school assembly that will include several Arapaho Indians and Tribal Elders.
Coverage: Arapahoe High School Shooting
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Students returned to classes at Arapahoe High School on Tuesday.
Teachers and staff went back to work at Arapahoe High School on Monday. Students will return to classes on Tuesday.
An online petition drive is asking Littleton Public Schools to give Arapahoe High School shooting victim Claire Davis a diploma at graduation in May.
When an armed student went into Arapahoe High School on December 13, many people sprung into action.
Claire Davis' father asked people to forgive the fellow student who shot and killed his 17-year-old daughter at Arapahoe High School.
The Arapahoe High School shooter entered the school through a door that should have been closed and locked, but was left ajar, Arapahoe County Sheriff Grayson Robinson said.
Gov. John Hickenlooper orders flags lowered to half-staff Wednesday in honor of Claire Davis, the student slain in the Arapahoe High School shooting.