A metronome left on in student's backpack led to Woodland Park Park High School on Thursday, Feb. 13. 

According to KRDO in Colorado Springs, Police were at the school because of a lockdown on Wednesday. The lockdown was the result of a suspicious man wearing camouflage and a backpack who was spotted in the school area two days in a row.

Students were evacuated while police investigated the ticking backpack only to find a metronome - a tool that musicians use to keep tempo. 

Read More at krdo.com