Israel's spy agency Mossad has worked with Brazilian security services to foil an attack on Jews in Brazil planned by the Iran-backed militant group Hezbollah, Prime Minister Benjamin Netanyahu's office says.
Brazil's Federal Police said they arrested two people, who they did not name, on terrorism charges in Sao Paulo.
They also carried out search and seizure warrants in Sao Paulo, Brasilia and Minas Gerais states.
Mossad thanked Brazilian security services for their role in helping to thwart the attack.
"The Brazilian security services, together with the Mossad and ... additional international security and enforcement agencies, have foiled a terrorist attack in Brazil, which had been planned by the Hezbollah terrorist organisation, directed and financed by the Iranian regime," it said.
Mossad said the "terrorist cell ... was operated by Hezbollah in order to carry out an attack on Israeli and Jewish targets in Brazil".
Hezbollah, an Iran-backed group in Lebanon, could not immediately be reached for comment. Neither could the Iranian government.
Brazil has relatively little history of domestic extremism.
In 2017, eight Brazilian men with ties to Islamic State were jailed for planning attacks during the 2016 Rio Olympics after a tip-off from the US FBI.
In 2021, the US Treasury designated three men in Brazil as members of an al-Qaeda-affiliated network.
US officials also keep a close eye on the Triple Frontier region between Brazil, Argentina and Paraguay, which is home to a large Lebanese diaspora community and a base for smuggling outfits and other organised crime groups.
The Federal Police operation comes amid rising global security concerns following the October 7 attack by Hamas on southern Israel and subsequent bombardment of the Gaza Strip by the Israeli military.
Brazilian Jewish leaders told Reuters last month that they had noticed a rise in anti-Semitic discourse online since the conflict began.
Hezbollah was set up by Iran's Revolutionary Guards in 1982 to fight Israeli forces that had invaded Lebanon.
The heavily armed powerful group has seats in parliament and government and acts as Iran's spearhead in Lebanon and the region.
Since the October 7 attack, Hezbollah has been engaging Israeli forces along the border, in the deadliest escalation since it fought a war with Israel in 2006.