Shocked and fearful Maine residents kept to their homes for a second night as hundreds of heavily armed police and FBI agents searched intensely for Robert Card, an Army reservist authorities say fatally shot 18 people at a bowling alley and a bar in the worst mass killing in state history.

Much of Thursday’s search focused on a property belonging to one of Card’s relatives in rural Bowdoin, where trucks and vans full of armed agents from the FBI and other agencies eventually surrounded a home. Card and anyone else inside were repeatedly ordered to surrender.