It's not entirely sure what's happening at the Stadio Luigi Ferraris in Genoa, but it appears that some sort of smoke bomb has gone off, and is affecting both the crowd and some of the players. After just 16 minutes, the referee has stopped play between Genoa and Milan until things have calmed down.
At first glance, it simply looked as though someone in a section had, well, farted, as the crowd wafted hands across their faces and pulled scarves above their noses. But then the crowd started swarming, abandoning some sections, tears on cheeks. It appeared that the players were affected as well, particularly at the visiting end, where Marco Amelia was frantically rubbing his eyes.
It's being reported that police are inspecting the stadium, trying to determine exactly what happened and who the culprits might have been. Play will resume, however, in hopes that this was a simple one-off.