1.   Officials anticipate that rivalry between leaders of the various drug factions could erupt into full scale war.

2.   A large number of homicides in Rio are related to infighting between rivaling drug factions or between drug lords and the police.

3.   The victims were found in Vila da Penha, which police say is the scene of a fierce battle between three rival drug factions fighting for control.

4.   According to the government, Cardinal Posadas was killed that same day amid the confusion that resulted from a gunfight at the airport between rival drug factions.