"The flight control system noticed a small leakage of ammonia and was able to identify where it is located. Astronauts will address a leak, as well as other tasks, during extravehicular activities scheduled for Thursday," the representative said.
He went on to note that the chemical leak was extremely small and poses no danger to the crew or to the station itself.
Currently, several astronauts are on board the ISS: Russians Anton Shkaplerov and Oleg Artemiev, Americans Scott Tingle, Andrew Foistel, Richard Arnold, and Japanese astronaut Norishige Kanai.