
Crowd trouble —
The Copa Libertadores round of 16 match between Boca Juniors and River Plate was suspended Thursday after Boca fans sprayed River players with an unknown irritant substance before the start of the second half.

Fever pitch —
High fences separate the fans from the pitch at Buenos Aires' La Bonbonera stadium, one of the most iconic stadiums in world football.

Superclasico suspension —
River defender Leonel Vangioni pours water on his face after being sprayed as he came out for the second half. He was one of four players reportedly taken to hospital for treatment.

Drone —
Prior to the match, Boca's fans flew a drone over the pitch mocking River. The drone related to River's relegation to the second tier of Argentine football in 2011.

Fan attack —
Forward Sebastian Driussi tries to rinse his eyes with water after being sprayed in the makeshift tunnel at half time.

Derby drama —
Vangioni tries wiping the spray out of his eyes with his shirt. The players stayed on the pitch for over an hour before the officials eventually decided to suspend the game.

Bad timing —
Midfielder Leonardo Ponzio was approached by a commentator on the pitch as he tried to wash out his eyes.

Cause for concern —
CONMEBOL -- South America's governing body -- are due to meet Friday to discuss what actions will be taken.

Stalemate —
River were 1-0 up from the first leg and the match was halted before the second half with the score 0-0.

Police escort —
River players had to leave the pitch under police shields after the match as Boca fans threw objects at them.

Safety fears —
River's players ducked for cover as they attempted to leave the field.