The crew of the International Space Station had to evacuate the U.S. section after an alarm was triggered around 3 a.m. CT.
U.S. crew members donned safety masks, sealed their section of the station, and moved to the Russian side. The crew is safe and in good shape, NASA said at a news conference.
NASA said that while the alarm could have been cause by an ammonia leak, there is no data to suggest that yet, and it was likely a faulty sensor or computer relay that caused it.
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Mary Ann Georgantopoulos is a reporter for BuzzFeed News and is based in New York.
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