  We present very high energy (VHE, E > 100 GeV) {\gamma}-ray observations of
the {\gamma}-ray binary system LS I+61 303 obtained with the MAGIC stereo
system between 2009 October and 2010 January. We detect a 6.3{\sigma}
{\gamma}-ray signal above 400 GeV in the combined data set. The integral flux
above an energy of 300 GeV is F(E>300 GeV)=(1.4 +- 0.3stat +- 0.4syst) *
10^{-12} cm^{-2} s^{-1}, which corresponds to about 1.3% of the Crab Nebula
flux in the same energy range. The orbit-averaged flux of LS I +61 303 in the
orbital phase interval 0.6--0.7, where a maximum of the TeV flux is expected,
is lower by almost an order of magnitude compared to our previous measurements
between 2005 September and 2008 January. This provides evidence for a new low
emission state in LS I +61 303. We find that the change to the low flux state
cannot be solely explained by an increase of photon-photon absorption around
the compact star.
