One of the fiercest confrontations between Begin and Ben-Gurion revolved around the Reparations Agreement between Israel and West Germany, signed in 1952. Begin vehemently opposed the agreement, claiming that it was tantamount to a pardon of Nazi crimes against the Jewish people. While the agreement was debated in the Knesset in January 1952, he led a demonstration in Jerusalem attended by some 15,000 people, and gave a passionate and dramatic speech in which he attacked the government and called for its violent overthrow. Referring to the Altalena Affair, Begin stated that "when you fired at me with cannon, I gave the order; 'Don't fire!' Today I will give the order, 'Do!'" Incited by his speech, the crowd marched towards the Knesset (then at the Frumin Building on King George Street) and threw stones at the windows, and at police as they intervened. After five hours of rioting, police managed to suppress the riots using water cannons and tear gas. Hundreds were arrested, while some 200 rioters, 140 police officers, and several Knesset members were injured. Many held Begin personally responsible for the violence, and he was consequently barred from the Knesset for several months. His behavior was strongly condemned in mainstream public discourse, reinforcing his image as a provocateur. The vehemence of Revisionist opposition was deep; in March 1952, during the ongoing reparations negotiations, a parcel bomb addressed to Konrad Adenauer, the sitting West German Chancellor, was intercepted at a German post office. While being defused, the bomb exploded, killing one sapper and injuring two others. Five Israelis, all former members of Irgun, were later arrested in Paris for their involvement in the plot. Chancellor Adenauer decided to keep secret the involvement of Israeli opposition party members in the plot, thus avoiding Israeli embarrassment and a likely backlash. The five Irgun conspirators were later extradited from both France and Germany, without charge, and sent back to Israel. Forty years after the assassination attempt, Begin was implicated as the organizer of the assassination attempt in a memoir written by one of the conspirators, Elieser Sudit.