Teachers and staff go back to work at Arapahoe High School

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Police gather outside Arapahoe County High School to respond to an active shooter situation on Dec. 13, 2013.

CENTENNIAL, Colo. – More than three weeks after a fatal shooting threw Arapahoe High School and the surrounding community into chaos, staffers went back to work on Monday.

“The safety and security of our students and staff remains our highest priority at Arapahoe High School,” Principal Natalie Pramenko said in a letter to parents.

Students will return to class on Tuesday. Final exams, postponed following the attack, are set to start on Wednesday. However, students who wish to skip finals and keep their current grade will be allowed to do so, the school announced.

The new semester will officially begin with a healing ceremony on Friday. Counseling and support services were expected to be on hand for students.

An expanded police presence was planned all week.

The attack occurred on Dec. 13, when a senior at the school fired shotgun blasts and set off explosives in the building. Claire Davis, 17, died of wounds suffered in the shooting.