A 750-foot-long oil tanker and its high-powered escort tug ... crossing the invisible U.S. border around sunset off Washington's Point Roberts, according to tracking data from MarineTraffic.com.

We also know the 183m-long tanker Stena Immaculate was carrying about 220,000 barrels of jet fuel - it took a while for this to be confirmed on Monday - some of which has poured into the North Sea ...

While the immediate effects of such a spill can be more drastic, cleanup operations are more straightforward. Volunteers clean up a bird from oil following mid-December tanker crash in the Kerch ...