1.   A tugboat collided with a cargo ship and sank in foggy conditions early Monday, forcing authorities to close a portion of the waterway.

2.   A tugboat collided with a cargo ship Monday on the Elk River and sank.

3.   A tugboat collided with a cargo ship and sank in foggy conditions early Monday, forcing authorities to close a busy waterway.

4.   A tugboat collided with a cargo ship in the fog and sank early Monday.

5.   Four crew members were missing after a tugboat collided with a cargo ship in the fog and sank, officials said.