A powerful earthquake in Japan has unleashed a tsunami threat across the Pacific region, including Hawaii and the Western United States. Watch CNN.com Live for continuing coverage on this breaking story.
Today's programming highlights...
Ongoing coverage - Japan earthquake/Pacific tsunami threat
11:00 am ET - Rep. Giffords health update - Doctors will update the public on the condition of Rep. Gabrielle Giffords, who is recovering from a gunshot wound to the head.
11:15 am ET - Obama briefing - The original purpose of President Obama's planned event was to discuss rising gas prices and the Libyan civil war. Given recent events, don't be surprised if the president discusses the Japan earthquake and Pacific tsunami threat as well.
2:30 pm ET - Libyan ambassador briefing - Libyan diplomats will call upon the United States to recognize the newly-formed National Transitional Council as Libya's legitimate government.
CNN.com Live is your home for breaking news as it happens.