That stadium is not on fire. It is merely fans making sure the Polish Cup kicked off with an immolation.
Legia Warsaw fans are still salty after getting DQ'd from the Champions League for fielding a suspended player, despite beating Celtic 6-1 on aggregate. So today, two days after Celtic were themselves knocked out, Legia fans raised this display: a big fat pig surrounded by the UEFA logo, with the caption "6<1 Because…
Defending Polish league champs Legia Warsaw were fined and forced to close down a stand for today's Champions League tie, after unspecified "racist behavior" at a match last month. Their fans responded with choreography and fire.