LEWISTON, Maine (AP) — Shocked and fearful Maine residents are keeping to their homes for a second night as hundreds of police and FBI agents search intently for Robert Card, a U.S. Army reservist authorities say fatally shot 18 people at a bowling alley and a bar. Wednesday’s attack in Lewiston was the worst mass killing in state history. On Thursday, heavily armed police surrounded a home in rural Bowdoin as they searched for Card but left hours later after searching the residence. Three of the wounded remain in critical condition. Meanwhile, schools and businesses are closed and people sheltered in their homes in communities as far as 50 miles away from Lewiston.