Louisville first responders are at the scene of a crash on the Clark Memorial Bridge in Kentucky, which spans the Ohio River, after a semi-truck crashed through the bridge's guardrail barrier and dangled over the water. 

The initial crash was reported around 12:15 local time. The truck was moving northbound on the bridge when it apparently crossed the lane and crashed through the bridge's guardrail, according to local reports. 

Dramatic video shows a first responder being lowered to the semi truck from a ladder in order to lift the driver to safety. 

The Clark Memorial Bridge is currently closed to traffic as first responders continue working. 

This is a developing story and will be updated.