Dozens of people, including club employees and visitors to the Boca Juniors museum, were ordered to leave the venue after an anonymous phone call, local media reported, citing police on Tuesday, reports Xinhua news agency.
Authorities were investigating the incident, newspapers La Nacion and Clarin said.
The fixture between Argentina's biggest rivals was suspended on November 24 after Boca's team bus was attacked with stones and bottles as it approached River's Monumental stadium in the northern districts of Buenos Aires.
The match was rescheduled for the next day but was postponed again just hours before kickoff. The first leg at La Bombonera ended in a 2-2 draw.
The fixture was shifted to Real Madrid's Bernabeu stadium after the Spanish club's President, Florentino Perez, offered the venue free of charge, according to the South American Football Confederation.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)