Efforts to save the lives of South Koreans being held by Afghanistan's hardline Taliban militia took on new urgency Tuesday after the rebels said they had killed a second hostage. The hardline Islamic insurgents also warned that more would die if the government did not meet its demand to free Taliban prisoners in its jails. A spokesman said a male hostage, among a group of 23 mostly female Christians captured on July 19, was shot dead late Monday after two deadlines that day had expired. The Taliban's claim could not be immediately confirmed. Police were dispatched to search for the...