An Orbital Sciences rocket operating under a NASA contract exploded shortly after launch on Tuesday evening, much to everyone's surprise — except, perhaps, Elon Musk.

Musk, the CEO of SpaceX, trashed Orbital Sciences for using outdated Russian engines during a 2012 Wired interview:

One of our competitors, Orbital Sciences, has a contract to resupply the International Space Station, and their rocket honestly sounds like the punch line to a joke. It uses Russian rocket engines that were made in the ’60s. I don’t mean their design is from the ’60s—I mean they start with engines that were literally made in the ’60s and, like, packed away in Siberia somewhere.

Two years later, Musk tweeted his condolences about the explosion, in which no one was injured:

Sorry to hear about the @OrbitalSciences launch. Hope they recover soon. — Elon Musk (@elonmusk) October 28, 2014

The Antares rocket was carrying a Cygnus spacecraft that was supposed to deliver supplies to the International Space Station on a routine mission. The exact cause of the explosion is still unknown. However, the Orbital Sciences team wasn't tracking any issues prior to launch. The private space company says it will conduct a thorough investigation starting immediately.

SpaceX has a similar contract with NASA to supply cargo to the space station.

[h/t @nanexllc]