A magnitude 8.9 earthquake rocked Japan, triggering a 13-foot tsunami that swept buildings off their foundations and washed away homes along the northeastern coast Friday.
Dozens of cities and villages along a 1,300-mile stretch of coastline were shaken by violent tremors. Airports were shut down, the Tokyo subway was closed and 4 million people lack power.
A tsunami warning was issued this morning across 20 countries, including the United States -- Hawaii and the entire U.S. West Coast. In Hawaii, the warning was downgraded to an advisory, according to the Pacific Tsunami Warning Center.
President Obama warned Americans in tsunami prone areas to heed all warnings, and said FEMA is monitoring the situation and coordinating with state and local officials.
Tsunami.Gov: More on preparedness and forecast info.
"Disaster in the Pacific": Watch "World News" at 6:30 p.m. ET, a special edition of "20/20" at 10 p.m. ET and "Nightline" at 11:35 p.m. ET for special coverage of the Pacific earthquake and tsunami. CLICK HERE for more.
If you are looking for a missing relative or friend in Japan, the International Committee of the Red Cross has set up a Family Links website. To register or search for a missing family member, CLICK HERE.
American citizens in Japan who need assistance or those seeking help finding loved ones in Japan can contact the State Department at JapanEmergencyUSC@state.gov or 1-888-407-4747.
The State Department has issued a travel alert. For updated information on travel and security in Japan, you may call the State Department at 1-888-407-4747 from inside the U.S. and Canada, or 202-501-4444 for callers outside the U.S.
Watch Live Stream: NHK's coverage out of Japan