Tsunami warning issued after magnitude 7 earthquake strikes California

A strong 7.0 magnitude earthquake has struck off the coast of northern California, according to the US Geological Survey.

The quake led to a tsunami warning along the coasts of both northern California and southern Oregon.

The earthquake's epicentre was marked near Ferndale, California, a small city in Humboldt County.

It was not immediately clear whether the earthquake caused any damage.

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