By Tsuyoshi Inajima, Michio Nakayama and Shigeru Sato

(Updates with weather forecast in 11th paragraph. See EXT2 <GO> for Japan quake coverage.)

March 15 (Bloomberg) -- Tokyo Electric Power Co.’s stricken nuclear power plant was today rocked by two further explosions and a fire as workers struggled to avert the risk of a meltdown.

A hydrogen blast hit the Fukushima Dai-Ichi plant’s No. 4 reactor, where Tokyo Electric earlier reported a blaze, Japan’s Chief Cabinet Secretary Yukio Edano said at a briefing. Four of the complex’s six reactors have been damaged by explosions.