Video footage from the launch at the Baikonur Cosmodrome shows a large plume of smoke coming from the rocket at the moment it failed and footage from inside the capsule shows the two astronauts being violently shaken about.
The Soyuz was carrying NASA astronaut Nick Hague, making his first spaceflight, and Roscosmos cosmonaut Alexey Ovchinin, making his second.
The capsule went into "ballistic descent mode" after the problem occurred, she said.
But they got into trouble and were forced to make an emergency exit. Soyuz is now the only means for crews to travel to and from the station, with commercial crew vehicles by Boeing and SpaceX not expected to be ready to enter service before the middle of 2019.
Both astronauts were said to be "alive" on Thursday morning, but their exact condition is not known - according to local Russian report.
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The rocket was carrying US astronaut Nick Hague and Russian cosmonaut Alexei Ovchinin.
"Shortly after launch, there was an issue with the booster". They were scheduled to dock with the space station later Thursday and spend six-months there.
"Teams have been in contact with the crew". The Soyuz MS-10 spacecraft has made an emergency landing.
It's the first space mission for Hague, who joined NASA's astronaut corps in 2013.