Liam Ramos, 5, isn’t the only child in detention. Teachers and parents describe kids being hunted by federal agents. COLUMBIA HEIGHTS, Minn. – The hallways at Valley View Elementary School used to be bustling with children, eager to get to class and see their friends. They’re silent now. Outside, immigration agents drive up and down the street multiple times a day. They linger at dismissal time, when kids are walking home or being picked up. They follow parents driving other people’s kids home;