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 A tsunami alert was issued for the Ariake sea and Yatshushiro sea but was later withdrawn.At least two people are dead after two earthquakes struck southern Japan. The initial magnitude 6.5 quake was followed by a second tremor that was only slightly less powerful. But there was no danger of a repeat of the Fukushima disaster five years ago.