Federal officials detained two Northwest airlines flights from Japan when they arrived on the west coast today, one in Seattle, the other in San Francisco. Two men on the Seattle flight were taken off the plane for questioning. Northwest officials say their baggage was cleared and eventually the planes were returned to service. Associated Press reports quote a San Francisco airport spokesman saying federal officials were concerned someone MAY HAVE BEEN carrying anthrax on the aircraft. FBI officials would only say they'd received some public safety information which was of concern. Northwest Spokeswoman Kathy Peach says airline officials are not aware of any anthrax concerns.