In Sao Paulo, state police launched a massive anti-gang operation on Friday, a day after a 30-year-old special forces officer was shot dead while on patrol in the port city of Guaruja.
Officials said on Wednesday that 16 alleged criminals have been killed in the ongoing operation there, up from 14 earlier.
Meanwhile, in the northeastern state of Bahia, officials said 19 suspects had been killed in three different towns since Friday in clashes with police.
In all cases, officials said police retaliated after the attack.
However, the killings have been criticized by human rights groups in Brazil, where allegations of abuse by security forces are frequent.
Amnesty International said, the Sao Paulo operation “shows clear signs of revenge for the death of a police officer.”