Joshua Riibe—the last person seen with missing University of Pittsburgh student Sudiksha Konanki—has been detained once again, this time in Puerto Rico, while trying to return to the U.S. due to an issue with his travel documents.Riibe, originally from Iowa, was stopped by airport officials at Luis Muñoz Marín International Airport as he attempted to board a connecting flight back home. According to Noticias SIN, authorities flagged his temporary travel documents issued in the Dominican Republic because they hadn’t been properly stamped,

His father, Albert Riibe, expressed visible frustration when speaking to the press. “I’m just a dad whose son was taken from him… We’ve just spent two weeks trying to stay together,” he said at the airport.This most recent hold-up comes shortly after a Dominican judge gave Riibe the green light to leave the country. Following a nearly five-hour court session on Tuesday, Judge Elvis Delgado ruled that the 22-year-old could return to the U.S.