The Marko Perković Thompson concert, the largest concert in Croatian history, is taking place at the Zagreb Hippodrome.
According to Croatian media reports, more than half a million people attended the concert.
Organizers confirmed to HRT that 504.000 people gathered at the Hippodrome.
Thompson opened the concert at 21 p.m. with the song "Rise from the Shadows."
"Praise be to Jesus and Mary, my dear people. I want to express my deep gratitude to you, first of all, for coming in such large numbers," said Thompson.
He pointed out that the audience did not only come from Croatian regions, but also from other European countries.
"Now, with this concert, we will show great unity. I want to tell all of Europe to return to its tradition, to its Christian roots. Only in this way can Croatia be strong again," said the singer.
He added that we should "hold on to the heroes who created the homeland."
"Let us not exalt ourselves above our common success, but rather thank the dear God for bringing us together here," said Thompson.
During the day before Thompson's concert at the Zagreb Hippodrome, police detained 44 people, and 16 sought medical attention.
One person was detained for disturbing public order, and 43 for pyrotechnics.
Marko Perković was banned from performing in several countries due to his sympathies towards the Ustasha regime during World War II.
Ustasha symbols are a frequent sight at his concerts, and he begins one of his most famous songs by shouting a fascist slogan used by the regime allied with Nazism.
Ahead of the concert, it was announced that more than 450.000 tickets had been sold.
The largest number of tickets were purchased in Croatia, around 350.000, and a large number of tickets were also purchased in Germany (around 22.000), Austria (around 18.000) and Bosnia and Herzegovina (around 10.000).
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