(NBC News) A mistake at Purdue University sent a huge clock tumbling from a bell tower, crashing to the ground earlier this week.
Video of the accident was recorded by a student.
It shows the clock being hoisted to the top of the tower and then somehow being released.
It appears to hit a hoist bucket holding two workers before falling to the ground below. Thankfully no one was injured.
The company doing the renovation says its reviewing what can be done to prevent something similar going forward.
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