BOSTON — Federal, state and local law enforcement agencies are gearing up to secure the Boston Marathon.Public safety officials and representatives from the Boston Athletic Association, which organizes the race, are scheduled Tuesday morning to discuss safety measures being put in place for the 122nd running of the marathon on April 16.The route takes runners through eight cities and towns, complicating efforts to police the course.Agencies involved in securing the race include the FBI, Boston police, state police and others.