"If someone did want to do something at such a sporting event, nothing is stopping them from doing it at the gates" - this has already happened in Russia (Volgo

"If someone did want to do something at such a sporting event, nothing is stopping them from doing it at the gates" - this has already happened in Russia (Volgograd, 2013). A suicide bomber blowed himself up in front of a security gate at the main train station. Between 37 and 50 injured, 16 dead as the result.