Associated Press: Thick drifts of volcanic ash blanketed parts of rural Iceland on Friday as a vast, invisible plume of grit drifted over Europe, emptying the skies of planes and sending hundreds of thousands in search of hotel rooms, train tickets or rental cars. Polish officials worried that the ash cloud could threaten the arrival of world leaders for Sunday’s state funeral for President Lech Kaczynski and his wife Maria in the southern city of Krakow. So far, President Barack Obama, Russian …