Ahead of 50th anniversary memorial for Munich massacre, Steinmeier denounces 'shameful' delay in compensation deal for relatives of Israeli athletes murdered in Olympic attack

President will also meet German leaders to discuss impending Iran deal; says, 'Every visit to Germany carries with it tremendous personal weight'

Shaul Ladany was able to escape before Palestinian terror group captured him in 1972 massacre; shows family where he was previously held at Bergen-Belsen camp

Housing complex for athletes was transformed into residential district shortly after 1972 games; Israeli delegation's apartments acquired by research institute

Klaus Langhoff laments authorities' response to terrorism at 1972 games, saying it was 'doubly difficult' for his team to focus on sporting objectives after attack

Berlin to also acknowledge failures made during attack at 1972 Olympics, as part of deal reached with relatives of slain Israelis after initial compensation offer rejected

50 years after massacre of 11 athletes, author says it made Israel realize 'there would be no-one else' to protect it, a stance reflected in approach to Iran's nuclear program

Announcement of trip, participation in event comes a day after Berlin government reached agreement with relatives of Olympic victims, who had threatened to boycott ceremony

False reports initially said Israeli athletes had been freed; but then reporters ran into Munich's distraught mayor and learned of the botched police operation

Berlin raises offer to 28 million euros; agreement 'cannot heal all wounds. But it opens a door to each other,' President Herzog and German counterpart say in joint statement