Tens of thousands have taken to streets across Slovakia after a journalist working on a story about the Italian mafia was shot dead along with his fiancee.
Slovakian president Andrej Kiska joined about 20,000 people in the capital Bratislava on Friday.
They held a minute's silence for Jan Kuciak and his fiancee Martina Kusnirova, who were found dead on Sunday at their home in the east of the city.
Marches were held in 25 towns and cities across the country and abroad, including in London, Paris and Brussels.
Demonstrators held photos of the 27-year-old journalist and carried banners with slogans such as: ''Mafia get out of my country," and "an attack on journalists = an attack on us all".
Some moved on to the government office to call on prime minister Robert Fico's administration to resign.
Mr Kuciak was looking into suspected Mafia links among Italian businessmen in eastern Slovakia when he was gunned down.
He had also reported on tax and subsidy fraud and links between businessmen and local politicians.
A retired Italian anti-Mafia prosecutor said Italian prosecutors had warned authorities in Slovakia of "dangerous" infiltration by a powerful organised crime syndicate before the killings.
Franco Roberti told Italian radio that Slovakian authorities had been warned, "but unfortunately they didn't heed us" with regards to the 'Ndrangheta crime syndicate's expansion into Slovakia.
Police in Slovakia raided houses linked to alleged members of the syndicate on Thursday.
Seven men were detained in the towns of Michalovce and Trebisov.
Mr Roberti suggested the group may have killed the journalist as "there was no other way to silence" him.
He also said "corruption" of local officials played a major role in the 'Ndrangheta's operations abroad.
Scotland Yard, the FBI and the Czech and Italian police, along with Europol, are assisting Slovakian authorities in the investigation.
Prime Minister Fico, who is known for his attacks on the media, was urged by the secretary general of the Reporters Without Borders group to apologise to journalists when they met on Friday.
Christophe Deloire branded the climate for journalists working in the country as "appalling".
The killings come less than five months after anti-corruption journalist, Daphne Caruana Galizia, died in a car bomb on Malta. The men charged with her murder are also accused of being involved with organised crime.
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