Who carries out investigation for election-related criminal offenses?

Brazil
Código Eleitoral Lei n. 4737, 15 july 1965 asamended by Lei n? 8.868/94 and Lei n?9.504/1997
Art. 357. Verificada a infra??o penal, o Minist?rioP?blico oferecer? a den?ncia dentro do prazo de 10 (dez) dias.
Once verified the criminaloffense, the prosecutor fill the criminal complaint within ten (10) days.
Art 357. Once verified the criminal offense, theprosecution will file the charge within ten (10) days.
Once verified the criminaloffense, the prosecutor fill the criminal charge within ten (10) days.
http://www.tse.jus.br/legislacao/codigo-eleitoral/codigo-eleitoral-1/codigo-eleitoral-lei-nb0-4.737-de-15-de-julho-de-1965#2