Belgian police held a Palestinian minister on board his plane on Friday after Dutch authorities withdrew his visa to attend a conference in the Netherlands, Dutch authorities and conference organizers said. Youth and Sports Minister Bassem Naim, a Hamas member, arrived in Brussels on a flight from Egypt after being granted a visa by Dutch authorities in Tel Aviv. But he was prevented from disembarking by 10 Belgian police, said Majed al-Zeer, director of the London-based Palestinian Return Center and one of the organizers of Saturday's conference on Palestinian refugees. "What happened on the flight was the humiliation of the Palestinian people," Zeer told The Associated Press. "He was not even allowed to go to the toilet."