Eight men are reported to have been charged over the death of a US graduate found beaten on the Greek island of Zante a week ago.
Bakari Henderson, 22, from Texas was brutally attacked after he left a bar following a dispute, police said.
Six Serbian nationals, a 34-year-old Greek and a 32-year-old British national of Serbian descent were detained after CCTV footage emerged.
A seventh Serbian tourist is also being questioned, Greek news agency ANA said.
Henderson suffered severe head injuries in the attack at the coastal resort of Laganas, and was pronounced dead after being taken to hospital.
Witnesses reportedly told police he angered one of the bouncers when he and his friends tried to take a selfie with a waitress.
Footage later obtained by the police shows Henderson being attacked by a group of men outside a shop.
The suspects are accused of beating Henderson and leaving him unconscious in the street.
Police have reportedly ruled out racism or nationalism as a motive for the attack.