THE HAGUE, Netherlands (AP) — A powerful storm pummeled Europe with high winds and snow Thursday, killing at least six people in three countries, grounding flights, halting trains, ripping roofs off buildings and flipping over trucks. The Dutch national weather service recorded wind gusts of up to 140 kph (87 mph) in the southern port of Hook of Holland as the storm passed over. Amsterdam's Schiphol briefly halted flights for an hour in the morning, and airline KLM already had scrapped more than 200 flights before the storm.