Bulgarian authorities on Tuesday will release and won't charge a man taken into custody in connection with the slaying of Bulgarian television reporter Viktoria Marinova, whose body was found after she highlighted possible government corruption.
Marinov said investigators are now working to identify any "contacts and problems" she had before the murder.
We condemn any effort to intimidate journalists from reporting on corruption.
On the advice of legal counsel, journalists at TVN were not commenting to their colleagues.
Ms Marinova was a director at TVN, a small TV station in Ruse, and presented two investigative programs.
In the Bulgarian capital of Sofia, mourners gathered outside a church.
Most of those killed in 2017 were murdered for their investigations into political corruption and organised crime, according to several media rights groups cited by the BBC. It featured the work of two journalists investigating the alleged misuse of public European Union funds by a network of corporations in the region.
The minister said investigators had spoken to Ms Marinova's family and friends and "there is no apparent link to her work".
"Again a courageous journalist falls in the fight for truth and against corruption", Frans Timmermans, vice president of the European Commission, said Monday in Brussels.
The killing turns the spotlight not only on Bulgaria - which is ranked 111th in the world for press freedom, the lowest of any European Union state - but also non-EU states including Ukraine Kosovo, Montenegro and Serbia.
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Sotir Tsatsarov, Bulgaria's prosecutor general, confirmed the arrest of Severin Krasimirov, 21, a Bulgarian citizen, but gave no further details.
"We have collected a lot of evidence which for the time being suggests that the person is guilty. The actions were extremely brutal and extremely monstrous".
Last month, the two reporters had been detained by Bulgarian police.
Journalists' groups and foreign officials demanded a "full and thorough investigation" into Ms Marinova's death.
Marinova's body was found on Saturday.
However, it added: "As long as there are no solid and proven facts, speculation that the incident is connected to freedom of expression. are unacceptable".
In the Reporters Without Borders World Press Freedom Index, Bulgaria is rated 111 out of 180 countries, the lowest of any country in the EU.
The German government also sharply condemned the slaying, with the Foreign Ministry saying it was imperative "that there's a fast investigation and that this awful event will be illuminated as comprehensively as possible".
A spokesman for the German Foreign Ministry said that it's imperative "that there's a fast investigation and that this disgusting event will be illuminated as comprehensively as possible".
Giegold said, "First Malta, then Slovakia, now Bulgaria". "And there is rampant impunity, which means that you can sometimes silence a critical journalist or close down an investigation by having that journalist killed". The prosecutor's office said three additional prosecutors were being sent to Ruse to back up the investigation.