NEW : Britain joins the US in urging residents within 50 miles to evacuate . NEW : Water is poured from above on the Fukushima nuclear plant 's No . 3 reactor . Nearly 100 are dead or missing , police say . CNN 's Kyung Lah , Stan Grant , Jill Dougherty , Anderson Cooper , Kevin Voigt , Jiyeon Lee , Michael Martinez , Holly Yan and Sean Morris contributed to this report . Emperor Akihito : ' Remember everyone who has been killed ... and help '
NEW : Britain joins the US in urging residents within 50 miles to evacuate . NEW : Water is poured from above on the Fukushima nuclear plant 's No . 3 reactor . Nearly 100 are dead or missing , police say . Emperor Akihito : ' Remember everyone who has been killed ... and help '