Singapore authorities arrested a man on his return to the city-state on Wednesday after he was jailed for spying for China in the US, saying they would investigate whether he posed a security risk.
Dickson Yeo, a Singapore citizen, returned to Singapore after serving prison time in the United States for acting as an illegal agent of Chinese intelligence.
The Internal Security Department (ISD) will interview Yeo to establish if he had engaged in activities prejudicial to Singapore's security, it said in a statement.
"Singapore will not allow our nationals to be subverted or used by any foreign actors for activities prejudicial to our security and national interests," the ISD said.
"The government takes a very serious view of any Singaporean who enters into a clandestine relationship with a foreign government and engages in espionage or subversive activities at the behest of the foreign power," it said, adding such individuals will be dealt in accordance with local laws.
Thousands of Iranians turned out to mourn President Ebrahim Raisi in the city of Tabriz on Tuesday, after he was killed in a helicopter crash near the Azerbaijan border at the weekend along with his foreign minister and seven others.
A Singapore Airlines flight from London made an emergency landing in Bangkok on Tuesday due to severe turbulence, officials said, with one passenger on board dead and local media reporting multiple injuries.
Charges were dropped on Tuesday against nine Egyptian men accused of causing one of the Mediterranean's deadliest shipwrecks off Greece last year, after a Greek court said it had no jurisdiction to hear the case because the disaster occurred in international waters.
A would-be prince, a former judge and parliamentarian, and retired military officers were among nine alleged conspirators who went on trial on Tuesday for a suspected "Reichsbuerger" plot to overthrow Germany's democracy.
Israeli forces raided Jenin in the occupied West Bank on Tuesday in an operation that the Palestinian health ministry said killed seven Palestinians, including a doctor, and left nine others wounded.