In response to specific allegations contained within the report, police said they "do not comment Online Cigarettes Store USA on individual cases" and said those alleging abuse should make a complaint with the police watchdog instead.
Frequently violent demonstrations featuring hundreds of thousands of protesters have raged in Hong Kong for more than three months.
Anti-government protesters have hurled rocks, bottles and petrol bombs as well as used slingshots in their battles Cheap Newport Cigarettes Online Sale with police who have responded with tear gas, rubber bullets and water cannon.
Videos of police baton charging and beating protesters have frequently gone viral online.Amnesty interviewed 21 people who had been arrested, 18 of whom were later hospitalised for injuries.
"Almost every arrested person interviewed described being beaten with batons and fists during the arrest, even Cheap Newport 100s Cigarettes Websitewhen they were not resisting and often already restrained," the report's authors wrote.
Most interviewees reported the violence stopped once in custody.
But one detainee said he was assaulted for being uncooperative and another described seeing police shine a laser into the eye of a young detainee -- a tactic protesters have employed against police.
Two defence lawyers also claimed their clients were beaten.
Multiple suspects described lengthy delays in receiving medical attention or access to defence lawyers.
Hong Kong's police denied those allegations, saying officers "respect the privacy, dignity and rights" of those arrested.
Hong Kong's protests were sparked by a now-abandoned plan to allow extraditions to the authoritarian Chinese mainland.