In June 1942, Heydrich was assassinated in Prague in Operation Anthropoid, led by Jozef Gabčík and Jan Kubiš, members of Czechoslovakia's army-in-exile. Both men had been trained by the British Special Operations Executive for the mission to kill Heydrich. During the two funeral services, Himmler—the chief mourner—took charge of Heydrich's two young sons, and he gave the eulogy in Berlin. On 9 June, after discussions with Himmler and Karl Hermann Frank, Hitler ordered brutal reprisals for Heydrich's death. Over 13,000 people were arrested, and the village of Lidice was razed to the ground; its male inhabitants and all adults in the village of Ležáky were murdered. At least 1,300 people were executed by firing squads. Himmler took over leadership of the RSHA and stepped up the pace of the killing of Jews in (Operation Reinhard), named in Heydrich's honour. He ordered the camps—three extermination camps—to be constructed at Bełżec, Sobibór, and Treblinka.