Second powerful earthquake in Japan kills 20 and leaves thousands trapped amid tsunami alertPrime Minister Shinzo Abe admitted rescuers are in a "race against time" to save lives following the 7.3 magnitude quakeAt least 20 people are dead and thousands more trapped and injured after a second powerful earthquake hit Japan. The quake measured 7.3 on the Richter scale and hit near the city of Kumamoto as it was still recovering from another earthquake on Thursday. A tsunami alert was issued for the Ariake sea and Yatshushiro sea but was later withdrawn.