The SS-Sonderkommandos enlisted the aid of antisemitic elements from the Hungarian gendarmerie and pro-German administrators from within the Hungarian Interior Ministry.[278] Round-ups began on 16 April, and from 14 May, four trains of 3,000 Jews per day left Hungary and traveled to the camp at Auschwitz II-Birkenau, arriving along a newly built spur line that terminated a few hundred meters from the gas chambers.[279][280] Between 10 and 25 percent of the people on each train were chosen as forced laborers; the rest were killed within hours of arrival.[279][281] Under international pressure, the Hungarian government halted deportations on 6 July 1944, by which time over 437,000 of Hungary's 725,000 Jews had died.[279][282]