NEW : The IDF raises the level from 5 to 7 . 7 is the highest possible level and is on par with 6 . At the plant Monday , workers began installing sections of silt fence around the water intakes at the back of the plant to screen out radioactive particles . Israel 's government has called for further evacuations . Cities covered by Monday 's warnings will evacuate in about a month , it says .
NEW : The IDF raises the level from 5 to 7 . 7 is the highest possible level and is on par with 6 . Israel 's government has called for further evacuations . Cities covered by Monday 's warnings will evacuate in about a month , it says .