Berlin celebrates fall of wall

World leaders have gathered in Germany's capital to celebrate the 20th anniversary of the fall of the Berlin Wall, beginning the day's events with a prayer service. Angela Merkel, Germany's chancellor and Horst Koehler, the country's president, joined a congregation at a former East Berlin church, where pro-democracy rallies were held in 1989. "We remember the tears of joy, the faces of delight, the liberation," Lutheran Bishop Wolfgang Huber said at the Gethsemane Church. But Merkel, who grew up in communist East Germany, used the opportunity to raise concerns about the work still to be done, saying "German unity is still incomplete". "We must tackle this problem if we want to achieve equal quality of life [in east and west]," she told ARD public television on Monday.