Astronauts aboard the International Space Station were forced to take cover from debris flying past the satellite twice on Monday morning amid multiple reports that Russia shot down a space satellite over the weekend.

U.S. Space Command confirmed a rare "debris-generating event" took place, but it did not provide further details or confirm the Russian satellite reports.

"We are actively working to characterize the debris field and will continue to ensure all space-faring nations have the information necessary to maneuver satellites if impacted," a Space Command spokesperson said. "We are also in the process of working with the interagency, including the State Department and NASA, concerning these reports and will provide an update in the near future."

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CNN's Space and Defense Correspondent Kristin Fisher said two U.S. officials were attributing the debris to a Russian anti-satellite weapons test, although U.S. Space Command has not done so.

Some of the astronauts on the space station, made up of crew members from the United States, Russia, and Germany, took cover inside the Soyuz MS-19 spacecraft, while others relocated inside the Crew Dragon as the debris passed, according to reports.

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All crew members have since been allowed to return to the space station. An official at NASA's Mission Control Center in Houston gave an update saying the space debris fragments "have passed." The crew members did not notice "any signs" of collision with space debris.

John Kirby, the senior spokesman for the Pentagon, said in a briefing Monday that the most immediate concern is the debris itself, which could become a hazard to the ISS. He also expressed concerns regarding Russia's endeavors into space.

"We watch closely the kinds of capabilities that Russia seems to want to develop, which could pose a threat not just to our national security interest but the security of other spacefaring nations," Kirby said. "And again, we’ve been very clear we would like to see norms for space so that it can be used responsibly by all spacefaring nations.”