(CNN) Marjory Stoneman Douglas High School in South Florida is still reeling from a shooting Wednesday that left 17 people dead. These video moments, some captured on cellphones, show what that terrifying afternoon was like.

Students hide

JUST WATCHED Video shows students hiding as shots are fired Replay More Videos ... MUST WATCH Video shows students hiding as shots are fired 00:39

A student posted this video to social media showing his peers hiding in a classroom while the gunman opened fire.

Police storm into classroom

JUST WATCHED Video shows moment authorities enter classroom Replay More Videos ... MUST WATCH Video shows moment authorities enter classroom 01:00

A student captured the moment police entered a classroom of terrified kids after the deadly massacre.

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