Hong Kong (dpa) - Joshua Wong, a key democracy activist in Hong Kong's mass protests against the government, was detained by police on Sunday shortly before he was due to depart to Germany. In a tweet on Wong's account by his lawyer, the activist said he had been arrested by officials at the airport. He was accused of breaching his bail conditions, the 22-year-old added. Since June 9 Hong Kongers have been taking to the streets in mass anti-government protests triggered by a controversial draft law that would have allowed suspects to be extradited to mainland China. The proposal has since been withdrawn.The protest movement fears an increasing influence of the Chinese government on Hong Kong. The demonstrators are also demanding an independent investigation into police violence against protesters. The German newspaper Bild reported that Wong had been on his way to Berlin, where he was invited to an event organized by paper on Monday evening.Wong said in the tweet he assumed that the arrest was a mistake. A preliminary legal consultation had shown "that the court had recognized and approved my trips to Germany and the USA when it granted a bail on August 30," Wong said.The activist expected to be released after a hearing on Monday morning.Wong had been detained for several hours at the end of August and released on bail. He, like his fellow activist Agnes Chow, is accused of having encouraged and participated in an illegal meeting in the Chinese special administrative region in June.# Notebook## Internet links - [Wong on Twitter](http://dpaq.de/IDkoA) - [Bild report, in German](http://dpaq.de/IpoLf)