At a news conference here on Friday , the secretary of public security for the state of Rio de Janeiro , Marcelo Itagiba , strongly hinted that the gunmen were military police officers angered by a recent campaign to crack down on police violence and corruption .
Marcelo Itagiba /people/person/place_of_birth Rio de Janeiro
IN DT NN NN RB IN NNP , DT NN IN JJ NN IN DT NN IN NNP IN NNP , NNP NNP , RB VBD IN DT NNS VBD JJ NNS NNS VBN IN DT JJ NN TO VB RP IN NN NN CC NN .
Marcelo Itagiba
PERSON
Rio de Janeiro
LOCATION
/people/person/place_of_birth