Space debris has damaged a cooling system radiator of the International Space Station (ISS) U.S. segment in the P4 truss section, the NASA website said.
It said images of the ISS surface captured by external cameras were being analyzed and there was no ammonia leak from the cooling system.
The NASA delegation to the Russian Mission Control Center has offered no comment on the situation.
The ISS is manned by Russia's Alexander Skvortsov, Oleg Artemyev and Maxim Surayev, U.S. astronauts Steve Swanson and Reid Wiseman and German astronaut Alexander Gerst.
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