What to know about the Francis Scott Key Bridge collapse in Baltimore that left at least 6 missing

Search and rescue operations continue in Baltimore after a massive cargo ship lost power and struck the city's iconic Francis Scott Key Bridge early Tuesday morning, causing part of the bridge to collapse into the Patapsco River. The collapse sent vehicles, and people, into the water along with a stretch of the bridge itself. 

Almost 12 hours after the initial collision, no fatalities had been confirmed. Authorities said two people were recovered from the water, one uninjured and one who was hospitalized, and search teams were looking for at least six people who were unaccounted for. All were believed to be part of a construction crew that was working on the bridge filling potholes at the time of the collapse. 

Here is what we know so far about the collapse.