It really amazes me how lax security is at sporting events. A typical Brewers game will sell over 30,000 tickets sometimes over 40,000. The only security is a quick check of bags to make sure no alcohol is brought in. A group of 10 could bring in explosives, firearms, gas etc. The panic alone could kill 100s, let alone the attack itself.
I have written to my congressman and he informed me there is nothing the Feds can do as stadiums fall under state jurisdiction and thus it is up to them to provide security.