  During the first half of the K2K run, data corresponding to 4.8x10^19 POT
were accumulated. In this data set, 56 accelerator-produced neutrino events
were observed in the far detector, while the expected number from the near site
measurements is 80.6+7.3-8.0. This means that the probability of the null-
oscillation scenario is limited to less than 3%. A method for long-baseline
neutrino experiments has been established.
