Light tributes placed during a silent protest in memory of murdered journalist Jan Kuciak and his fiancée Martina Kusnirova, seen in photo, in Bratislava, Slovakia, on February 28, 2018.
CNN  — 

Slovak police have detained seven people in connection with the slaying of investigative journalist Jan Kuciak and his fiancée, the state news agency TASR reported.

Jan Kuciak, 27, and his fiancée, Martina Kušnírová, were found dead in Kuciak’s apartment in western Slovakia on February 26 with bullet wounds to the chest and head, respectively, according to the International Press Institute.

Kuciak reported on tax evasion and fraud among Slovak businesses, including people connected to the country’s governing party, Smer.

The individuals being detained, who are between 26 and 62 years of age, are believed to have ties to Italian organized crime, Police Corps President Tibor Gaspar stated at a news conference Thursday, according to TASR.

The people were detained after police raids in the Kosice and Presov regions.

Kuciak reported on tax evasion and fraud among Slovak businesses, including people connected to the country’s governing party, Smer.

On February 28, Aktuality.sk published the last unfinished report Kuciak was working on before he was killed.

The government of Slovakia said it was offering a reward of €1 million ($1.2 million US) for information about the killing.