It also comes during the playoffs for the National Hockey League (NHL) and National Basketball Association (NBA), high-profile games that typically take place before sold-out crowds. League officials typically do not share the specifics of their security measures for safety reasons. The attacker in Manchester targeted Europe's largest indoor arena, which was full to its 21,000 capacity, about the size of most NHL and NBA arenas. Major League Baseball, which recently began its season and mostly plays its games in outdoor stadiums that are larger than NHL and NBA arenas, has a similar approach to fellow leagues. The National Football League, which has some stadiums that hold more than 80,000 people, is currently in its off-season.

Source: dna May 23, 2017 21:45 UTC