A tanker loaded with 2,400 tonnes of sulphuric acid mysteriously capsized on the Rhine river in Germany yesterday.
Two crew members are missing, feared drowned, following the incident.
There are no indications that any of the deadly sulphuric acid has leaked into the water, but emergency workers are fearful that they may not be able to right the 110-metre tanker quickly, increasing the risk of a spillage over the coming days.
Investigators are mystified as to why the tanker capsized. "Suddenly the ship just disappeared from the radar," said Martin Mauermann, the head of the Office of Water and Shipping in Bingen, adding that could mean the vessel submerged completely before floating to the surface.
Authorities closed a stretch of the Rhine to shipping.