1.   Because the tugs push and pull engineless barges carrying cargo, their crews must be entirely American.

2.   Coast Guard officials said the North Cape, which ran aground Friday afternoon after the tug pushing it caught fire and was beached, had stopped leaking oil Monday.

3.   The tugs push or pull barges carrying oil, grain, scrap metal or trash, and help clumsy passenger ships steer through the slender waters.

4.   The tug was pushing two empty barges Tuesday when it collided with the dredge tender, the Coast Guard said.