Belgian police stopped a bus coming from France after a passenger reported a conversation about a potential terrorist attack, officials said. A spokesperson for the public prosecutor's office in East Flanders stated that the bus, operated by FlixBus, which runs a service between the city of Lille in northern France and Brussels, was stopped in the town of Wetteren near the Flemish city of Ghent. The spokesperson added that police arrested three passengers and will question everyone on board to determine whether the suspicious conversation was substantiated. A spokesperson for Belgian Minister of Justice Vincent Van Quickenborne stated that a passenger heard a suspected terrorist conversation and reported it to the police, who subsequently stopped and searched the bus. Belgian police and security forces are maintaining heightened vigilance following recent terrorist attacks in the country.