Ķuzis said that the six suicides are "very alarming", as there are a number of cases each year but not as many as in 2015.
A probe leads to think that the cases were tied to socioeconomic aspects, such as financial problems and gambling addiction, according to Ķuzis.
He said that less educated and lower-ranking police officers were discovered to be more prone to commit suicide.
The policemen who committed suicide were hiding their problems, said Ķuzis.
Policemen are now tasked to report to their seniors if they are having any psychological problems.
The higher-ranking policemen should be noticing changes in the behavior of their subordinates, however the skill to spot these changes requires extra training, said the police chief.