the annoucement is also on their OHP which refers to their blog.
the specific entry was posted by Nobara on 5th March 2010 : http://blog.obscure-web.com/article/35997237.html
I don't know any japanese myself so can't give a particularly good translation
personally, I was both shocked yet somehow I had expected something like this will happen...
either way, I wish all 3 of them good luck for their future acitivies and hope to see them return with something new and inspiring in the music scene!