Iranian President Hassan Rouhani began a two-day visit to Switzerland on Monday and is expected to travel to Austria next.
The Mujahedeen-e-Khalq, widely known as MEK, is an exiled Iranian opposition group detested by the Islamic Republic of Iran. The formerly armed group had been on European Union and U.S. terrorism lists before being delisted from both. The weekend rally had sought to plant the seeds for regime change in Iran.
"Regime change in Iran is within reach as never before," leader Maryam Rajavi said at the event.
The Belgian prosecutors' office said Belgian security services, France's domestic intelligence service and German judicial authorities had been instrumental in preventing another terror attack in France.
Police raided five homes after the couple was detained but did not disclose if they found additional evidence.
Three people also were detained for questioning in France, but two of them were released Monday with no "incriminating elements" uncovered, a French judicial official source said. Investigators worked to determine the Belgian suspects' ties to the third person detained in France, according to the judicial source who asked to remain anonymous because he wasn't authorized to discuss an ongoing investigation.
Trump's recent appointment of John Bolton, who spoke at a MEK rally before he became national security adviser, and Giuliani, a regular MEK headliner, are seen as moves that could strengthen the group's bid for U.S. backing.
TATP, the explosive that Belgian authorities said was found in the suspects' car, has been used in several terror attacks in Europe in recent years, including the 2016 bombings in Brussels that killed 32 people.
