Boca Juniors vs River Plate in the Copa Libertadores final!

I read that there was crowd trouble at this training session, since 80000 people showed up at a stadium that only holds 50000.

The second leg will be played at River Plate's stadium, with only home fans allowed - apparently that's been the practice in Argentina for the past few years, to prevent violent clashes. It's sad that such a measure is needed.