A 7.3 magnitude earthquake has struck off the coast of Japan near the crippled Fukushima nuclear power plant.

A tsunami warning has been issued and 10 foot tall waves are predicted to make landfall soon.

The earthquake raises serious questions about the stability of the already-ravaged Fukushima plant that hit by a massive earthquake and tsunami in 2011.

“All nuclear plants on the coast threatened by the tsunami are shutdown in the wake of the Fukushima disaster,” Yahoo News reports. “Only two reactors are operating in Japan, both in the southwest of the country. Even when in shutdown nuclear plants need cooling systems operating to keep spent fuel cool.”

The U.S. Geological Survey later downgraded the earthquake to a magnitude of 6.9.

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