The explosion of a suspected Russian nuclear-powered cruise missile last week has caused a lot of confusion and anxiety, fueled in part by Russian authorities’ continuing secrecy around the accident.
Russia has provided few details known about the blast, which a U.S. official told ABC News “likely” took place during a test on the missile, named the SSX-C-9 Skyfall by NATO and as the 9M370 Burevestnik (Storm Petrel) by Russia.
Here’s what we know and don’t about the incident.