After the crew reported the smell of smoke and burning plastic, the Russian Zvezda module of the International Space Station (ISS) issued an alarm.

Astronaut Oleg Nivitsky notified the Russian Mission Control Center of the incident at around 5 am. According to a report by RIA Novosti, on Thursday, Moscow time, an inspection found harmful substances in the medical cabinet of the module.

Astronaut Toma Pesce said that the smell of burnt plastic or electronics managed to enter the American part of the International Space Station from Russia through the ventilating device.

Although the module’s purification system has purified the air, the source of smoke and the smell of burnt plastic have not been found, the RIA report said.

The Russian space agency Roscosmos tweeted that the system is operating normally and the air on board “meets standard parameters.”

It said the crew will continue spacewalk training on Thursday.

In this NASA lecture, you can see the International Space Station above the earth. According to reports, smoke appeared in the Russian part of the station on Thursday, September 9.
NASA/Getty

This is a developing story and will be updated as more information becomes available.