That is their favorite ploy to save a sinking mkt–they have used that a lot lately
Then this, from Zero hedge=
But then – shortly after Europe closed… someone (cough BoJ cough) decided to catch USDJPY at 117.95 and lift it miraculously 170 pips to save risk assets from a serious day…
http://www.zerohedge.com/news/2014-12-09/markets-turmoiled-5th-hindenburg-looms