Logan Church: US correspondent on the six construction workers who disappeared following Baltimore Key Bridge collapse - Heather du Plessis-Allan Drive

The US Coast Guard says six construction workers missing in Baltimore Harbour are now presumed dead.

They were caught up in the catastrophic collapse of the Francis Scott Key Bridge overnight, after it was hit by a container ship.

US correspondent Logan Church says investigations are taking place to find out what happened in the leadup to the tragic collapse.

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