correction
A previous version of this article incorrectly identified the type of missile that struck the Rubymar. It was an anti-ship ballistic missile. The article has been corrected.
A cargo ship sank in the Red Sea after an attack by Houthi militants, taking about 21,000 metric tons of fertilizer down with it, posing a significant environmental risk to one of the world’s busiest waterways and the home of many coral reefs.
The Rubymar was struck by an anti-ship ballistic missile fired by the Iranian-backed Houthis on Feb. 18 and sank early Saturday after “slowly taking on water” since the attack, U.S. Central Command said on social media early Sunday local time.