Tigre have accused police of pulling guns on their players at half-time in the second leg of their Copa Sudamericana final at Sao Paulo.
Sao Paulo have been crowned Copa Sudamericana champions in controversial circumstances, with on-field violence causing the second leg of the final to be cancelled.
Sao Paulo grabbed the advantage in the first leg of the Copa Sudamericana final, holding Tigre to a 0-0 draw in Argentina on Wednesday.
Argentininian side Tigre claimed their place in the Copa Sudamericana final after edging Colombian outfit Millonarios on away goals.
Sao Paulo are through to the final of the Copa Sudamericana after they held Universidad Catolica to a 0-0 draw in the semi-final second leg.
Paraguayan giants Cerro Porteno recorded a narrow 1-0 triumph over Argentinian side Tigre in the first leg of their Copa Sudamericana semi-final.
Brazilian side Gremio claimed a 1-0 home win over Colombia's Millonarios to give themselves the edge in their Copa Sudamericana quarter-final tie.
An away goal from Michael Rios was enough to see Universidad Catolica through to the Copa Sudamericana quarter-finals despite a 3-1 defeat to Atletico Goianense.
Defending Copa Sudamericana champions Universidad de Chile could only manage a 2-2 draw against Ecuadorian side Emelec in the first leg of their last-16 tie.
Brazilian side Santos defeated Universidad de Chile 2-0 to win their first ever Recopa Sudamericana title in their centenary year.