A container ship adrift at 9 mph issued a "mayday" before colliding with the Francis Scott Key Bridge, causing it to collapse.
Cars fell into the Patapsco River, and six construction workers are missing.
The US Dept of Homeland Security declared a state of emergency, with extensive search-and-rescue efforts ongoing.
The cause is under investigation, with no evidence of terrorism.
The bridge will be rebuilt, impacting commerce in the region.
The ship's crew is safe, and pollution concerns are being addressed.
The community awaits answers on the collapse's root cause.
