The travelers presented certificates supposedly from private medical company SYNLAB. On Thursday, the company checked the certificates against its database and realised they were fakes, PPA spokesperson Kristjan Lukk said. Criminal proceedings were started for use of a forged document. A fine or three-year prison sentence can be handed down for using a fraudulent document. Speaking at a press conference on Thursday, Minister of the Interior Kristian Jaani explained the situation: "We got a tip from SYNLAB that counterfeit certificates are in use. This morning people from SYNLAB and the PPA visited Tallinn Airport to carry out checks. We checked about 500 people who wanted to travel by plane and we identified five counterfeit certificates."