CARACAS, Venezuela — Venezuela’s government has revoked permission for Brazil to serve as custodian of Argentina’s diplomatic missions in the country, alleging several anti-government opponents holed up for months in the Argentine ambassador’s residence had been plotting terrorist acts from the compound.

In a statement Saturday, Venezuela’s foreign ministry said it had notified Brazil of its decision, which will take effect immediately. It said it was forced to take action based on what it called evidence - which it hasn’t shared - that those who sought refuge in Argentina’s diplomatic mission were plotting.

Magalli Meda, the former campaign chief of opposition leader María Corina Machado, was among a half dozen government opponents who fled to the Argentina ambassador’s residence after Maduro’s chief prosecutor in March issued an order for her arrest for allegedly propagating destabilizing, political violence.

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In retaliation, Maduro broke off diplomatic relations with Argentine President Javier Milei’s right-wing government, which tapped neighbor Brazil to represent its interests and safeguard the asylum seekers.

There was no immediate response from Argentina or Brazil.

Since Friday, armored vehicles from the SEBIN political police have been parked outside the Argentina ambassador’s residence in a leafy Caracas neighborhood. Electricity to the diplomatic mission was also cut, according to Meda, who has taken to social media to denounce what she fears is an impending raid to arrest her and the other government opponents.