The Ottoman Minister of the Interior Talaat Pasha gave the detention order on 24 April 1915. The operation commenced at 8 p.m. In Constantinople, the action was led by Bedri Bey, the Chief of Police of Constantinople. On the night of 24–25 April 1915, in a first wave 235 to 270 Armenian leaders of Constantinople, clergymen, physicians, editors, journalists, lawyers, teachers, politicians, and others were arrested upon an instruction of the Ministry of the Interior. The discrepancies in numbers may be explained by the uncertainties of the police as they imprisoned people with the same names.