MEXICO CITY — Mexican authorities say that police in Ciudad Juarez have captured five alleged drug gang members suspected in the killings of two federal officers, including one whose body was hacked to pieces. One of the suspects is also believed to have acted as a lookout in the July 15 car-bomb attack on police that killed an officer and two other people, Luis Cardenas Palomino, regional security chief for the federal police, said Friday. He described the five men as members of the La Linea gang, which works for the Juarez drug cartel. He alleged they killed two federal...