Former Hungarian prime minister Viktor Orban accuses the government of political revenge after his brother is detained in a people-smuggling investigation.

Hungary has detained the brother of former Prime Minister Viktor Orban during its investigation of a people-smuggling case, Prime Minister Peter Magyar confirmed during a speech in Berlin.

Monday’s comments came after the Hungarian anti-graft body, said in a statement it and police had detained four people and searched homes at several sites in Budapest and Pest county as part of the case.

“Three out of the ex-ministers of Orban are already in custody,” Magyar said on the sidelines of a speech in the German capital.

“Already his brother today went to custody,” he added, referring to the former prime minister’s sibling, businessman Aron Orban, 49.

Orban alleges political revenge

Writing on Facebook, Viktor Orban dismissed his brother’s detention as an instance of political revenge.

“In this dirty game, the aim is the elimination of the political opponent and the establishment of a one-party system. I am the target, my younger brother is just a tool,” the former prime minister wrote.

In Monday’s statement, the National Asset Protection and Recovery Office did not identify the suspects detained and police also declined to do so in an emailed response to Reuters.

The body was set up to investigate allegations of corruption ⁠during Orban’s 16-year rule, which the latter has denied.

It was established by Magyar, who ousted Orban in an April election, and is central to his government’s anti-graft campaign which he has dubbed “Operation Purgatory”.

Vietnamese visa scheme under investigation

Monday’s statement had said the four detained were suspected of helping Vietnamese citizens reach Western Europe for several months in 2024.

The perpetrators charged visa applicants a so-called recruitment fee at Hungary’s foreign missions in Vietnam, which they then shared, the authorities said.

The woman and three men held are suspected “of human smuggling committed as part of a criminal conspiracy for the purpose of financial gain,” police said.

In September, the NVVH said “selling political connections to obtain residence ​permits for employment.” was among the first four cases it planned to investigate.

Two former ministers from Orban’s government and former central bank chief Gyorgy Matolcsy are currently ​under arrest over graft accusations in separate investigations.