Fears grow of second explosion at earthquake-hit nuclear plant as exclusion zone around facility is widened to 13 miles

By DAILY MAIL REPORTER Smoke rising from the Fukushima Dai-ichi number one nuclear plant after a blast in Unit 1 on Friday Exclusion zone widened to over 13 miles as radiation levels rise Reactor 3 has lost its cooling systemSea water being used to cool reactor 170,000 people evacuated from area near plantUp to 160 people so far exposed to radiationJapan's nuclear crisis was growing today amid