(CNN) -- A tsunami warning has been issued for the western coastal areas of the United States and Canada after a massive earthquake struck off the coast of Japan. The West Coast and Alaska Tsunami Warning Center early Friday issued a tsunami warning for coastal areas along the United States and Canadian west coasts. The tsunami warning includes coastal areas of California and Oregon from Point Conception to the Oregon-Washington border. It also includes coastal areas of Alaska from Amchitka Pass to Attu. Tsunami warnings were issued Friday for at least 20 countries and numerous Pacific islands, including Japan, coastal Russia and the Marcus Islands, the Northern Marianas, Wake Island, Taiwan and Guam.
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NEW Warnings for the coastal areas along the United States and Canadian west coasts
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Tsunami warnings for 20 countries including Hawaii, Japan and coastal Russia
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Also the Northern Marianas, Wake Island, Taiwan and Guam
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Comes after a powerful 8.8-magnitude quake struck of the east coast of Japan
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Most powerful earthquake on record since the 2004 December 26 quake and tsunami
Authorities in the U.S. territory of @placeholder said a tsunami could hit the island as early as 7:09 p.m. (4:09 a.m.