#2 blast, 30 minutes after incident at #4, hole in number 2 reactor, suppression chamber caused blast. Little amount of radioactive substance released. Extreme smoke probably hydrogen and water coming in contact. 1,2 and 3 water injection continuing smoothly, we believe cooling is effectively done but hoe to keep it up. Radiation level, as of 10:22 am.........38ms, 400ms #4.100 ms. Larger than micro, levels can impact human health, digest info calmly. 6am, the 800 staff in plant, all but 50 have been evac'd.