Hundreds of flights were canceled in South Korea while North Korea's leader expressed concern about a potential loss of lives and crops as the countries braced for a fast-approaching typhoon forecast as one of the strongest to hit their peninsula this year.Packing a maximum wind speed of 162 kilometers (100 miles) per hour, Typhoon Bavi was already lashing South Korea's southern resort island of Jeju on Wednesday afternoon, flooding roads, toppling trees, ripping off signboards and knocking down at least one traffic sign as it passed over waters off the island's western shores. There were no immediate reports of casualties.South Korea's weather agency said the typhoon will start to affect the mainland at night before making landfall in western North Korea early Thursday. The agency warned of possible severe damage caused by very strong winds and heavy rainfall