Greek Prime Minister Kyriakos Mitsotakis has ordered a speedy investigation after a veteran crime journalist was shot dead on Friday.
Giorgos Karaivaz was shot at least six times with a silenced weapon by two men on a moped outside his home in Athens.
His death “shocked us all,” said a government spokeswoman.
Media freedom organisations said it must be established whether Karaivaz was killed for his work, which covered organised crime and corruption.
European Commission President Ursula von der Leyen urged justice for the “despicable, cowardly” murder.
European Parliament speaker David Sassoli tweeted that he was “devastated” by the news.
Karaivaz, who worked for private broadcaster Star TV and news blog bloko.gr, was fired upon as he got out of his car after work outside his house in the southern Athens district of Alimos, witnesses were quoted as saying by AFP news agency.