UPDATE: (CNN) -- NASA says communications have been fully restored with the International Space Station. Earlier in the day, NASA and the space station lost regular communications.
(CNN) -- NASA lost communication with the International Space Station on Tuesday and has established only sporadic connections since, according to NASA spokesman Josh Byerly.
The space agency says it is currently only able to communicate every 90 minutes when the facility passes over ground stations in Russia.
The station, which is carrying one American astronaut and two Russian cosmonauts, does not appear to be in danger, Byerly said.
The loss in communications is not considered unprecedented, though it's considered a cause for concern, officials said.
CNN's Devon Sayers contributed to this report
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