Uyghurs maintained that the attacks started after the night shift at around 12.30 a.m., when Han mobs stormed into Uyghur dormitories and started indiscriminate and unprovoked beatings.[21][22] Amateur videos posted online showed brutal attacks, and Han chasing Uyghurs through the dorm floors.[21] One man said that he saw that security had been overwhelmed by the arrival of outside gangs; he said it was common knowledge that the outsiders brought in machetes. Han and Uyghur witnesses interviewed by the foreign press thought the casualties had been understated by the authorities: a Han claimed to have killed seven or eight Uyghurs;[3] Uyghurs cited "merciless" assaults on those already in ambulances.[22] The rioting stopped soon after the police arrived.[22] A policeman explained their delay in arriving at the scene due to difficulties in assembling enough officers.[11] The two dead men were later named as Aximujiang Aimaiti and Sadikejiang Kaze, both from Xinjiang.[13]