A Bulgarian man has been detained in Germany over the rape and murder of television journalist Viktoria Marinova, as Prime Minister Boyko Borissov said journalists in Bulgaria had total freedom to write and report.
Ruse police chief Teodor Atanasov said the man's alibi was checked and that he was not a suspect.
Prosecutors are expected to hold a news conference later in the day as worldwide pressure mounts on authorities.
Mr Biro said he had never met Ms Marinova, but one of her colleagues had interviewed him and Mr Stoyanov about their work.
Even if Marinova's murder proves unrelated to her work, many local commentators were quick to point out that crimes against women are endemic in Bulgaria.
However, he said he would withdraw his support for a German member of the European Parliament, Manfred Weber, a leading candidate to become the next head of the European Commission, because of tweets he made associating the death of Marinova with those of Maltese journalist Daphne Caruana Galizia and Slovak journalist Jan Kuciak. Viktoria Marinova is the third journalist to have been murdered in Europe, during the last twelve months.
Azoulay said, "this is essential to defend freedom of expression and freedom of information in Bulgaria and, not least important, to ensure women's safety, dignity and freedom".
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Bivol.bg owner Assen Yordanov said he could not directly link Ms Marinova's killing to her work, but noted her 30 September show tackled "our very sensitive investigation into the misuse of European Union funds".
Authorities are now saying, however, that the motive was likely sexual assault, not an attack on a journalist, although the investigation is ongoing. Although no hypothesis is discarded, at this point the authorities have no reason to believe that the murder is related to Marinova's work, the chief prosecutor said.
She was a presenter on a current affairs talk programme called Detector, which had recently aired an interview with two Bulgarian investigative journalists exploring alleged fraud involving European Union funds and prominent businessmen and politicians.
The Commission's Vice President Frans Timmermans said he was shocked by the horrendous murder.
CPJ calls on the Bulgarian authorities to conduct a rigorous, thorough investigation into her killing.
Local people held a candlelight vigil October 8 and many left flowers to commemorate Marinova, who left a seven-year-old daughter.