OFFICIALS ORDERED FILIPINOS in the eastern coastal region to batten down Monday for Mike, the most powerful typhoon to strike the Philippines in nine years. The bureau said Mike had sustained winds of 150 mph gusting up to 175 mph. It was traveling west-northwest at 15 mph . . . A HOUSE FIRE early Monday killed four people and seriously burned a fifth, authorities said in Austin, Texas . . . A GROUP OF 111 boat people were re-arrested Monday, hours after a Hong Kong Supreme Court judge freed them, ruling the Hong Kong government had illegally detained the refugees for 18 months.