An asylum-seeking boy from Central America runs down a hallway in December after arriving at a shelter in San Diego. Immigrant advocates say they are suing the U.S. government for allegedly detaining immigrant children too long and improperly refusing to release them to relatives.

An asylum-seeking boy from Central America runs down a hallway in December after arriving at a shelter in San Diego. Immigrant advocates say they are suing the U.S. government for allegedly detaining immigrant children too long and improperly refusing to release them to relatives.