Szijjarto wrote on Facebook that the translation "Rijeka - The Hungarian Seas," which he says Index.hr wrote, was fake.
This, of course, is not true, because the plaque contains the words of poet and politician Lajos Kossuth "Fiume - Hungarians, To the Sea."
Szijjarto wrote in his Facebook status, which was forwarded to the media by the Hungarian Embassy to Croatia, that fake news factories did not refrain from turning nations against each other.
The wrong translation has elicited several political reactions, Syijjarto said.
The Hungarian government is of course interested in good neighbourly relations with Croatia, but it seems that some Croatian media outlets have entirely different objectives, the Hungarian Foreign Minister concluded.
Hungary's Prime Minister Viktor Orban has recently unveiled the "Hungarian Calvary" monument on the occasion of the centenary of the Treaty of Trianon when Hungary lost two-thirds of the territory it had had before.
The monument portrays a map of Great Hungary which encompasses parts of modern day Croatia, Serbia, Slovenia, Slovakia, Austria, Romania and Ukraine which were part of the then Hungary in the Austro-Hungarian Empire even though most of these areas were never inhabited by Hungarians.
Croatia reacted and expressed its protest to Hungary's ambassador in Zagreb however Grlic Radman does not think that Budapest is laying claims to Croatian territory.
"This is in memory of something, a historical reminiscence of something that existed one hundred years ago," Grlic Radman told reporters.
"Hungarians have never called for anything to be returned to them and in the migrant crisis they erected a wire fence where the Croatian-Hungarian border is, as such they know where the border is," said Grlic Radman who used to be Croatia's ambassador to Budapest.