Marinova's body was found on October 6 in a park near the Danube River in Ruse.
Through a United Nations spokesperson, Secretary-General António Guterres called on "all governments to strengthen press freedom and ensure there is accountability for crimes committed against journalists". Margaritis Schinas, a spokesman for European Commission President Jean-Claude Juncker, said Monday that the commission expected "a swift and thorough investigation. that will bring those responsible to justice and clarify whether this attack was linked to her work".
While there has been no link established to her work so far, the killing has angered and upset many in a country where people are frustrated with rampant corruption and an inefficient and graft-prone judiciary, for which Sofia has been repeatedly rapped by the European Commission.
An arrest was made in the murder of Bulgarian television reporter Viktoria Marinova who had been reporting on alleged corruption linked to European Union funds, Bulgarian national radio reported Tuesday. She said the regional current affairs show, "Detector", would do similar investigations.
A Romanian man was briefly detained on Tuesday in connection with Saturday's high-profile rape and killing of Bulgarian journalist Viktoria Marinova, but after questioning, a Bulgarian official said the unidentified man would be released without charge.
After her death, prosecutors opened an investigation into GP Group, the private Bulgarian building company that Biro and Stoyanov spotlighted in their report, according to The Associated Press.
Victoria Marinova had been reporting on corruption. Bulgarian authorities said they were investigating both professional and personal motifs for her murder.
IPCC: Report makes case for more ambitious global climate pact
Taalas says governments have about 30 years to stop using fossil fuels and limit global warming to 1.5 degrees Celsius. But that number is an average of temperatures all over the globe, so some places will become significantly hotter.
Marinova was a director of TVN, a small TV station in Ruse, and a TV presenter for two investigative programs.
The prosecutor general, Sotir Tsatsarov, said on Monday that while nothing was being ruled out, it was unlikely that Marinova's killing was connected to her work, reports the Times.
The man, who wasn't identified, would be freed "very shortly", said Teodor Atanassov, chief police officer of the northern town of Ruse.
Authorities have yet to find a motive behind the murder and said there was no evidence yet to connect her murder to her work.
Led by the anticorruption group BOETS, the demonstrators pledged to continue protesting daily until the journalist's killer is found.
Preliminary investigations showed the cause of death was blows to the head and suffocation.
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