At least nine men have been arrested in connection with the beating death of a 22-year-old American tourist outside a bar on the Greek island of Zakynthos last week. But police there are on the hunt for more suspects.

Bakari Henderson, of Austin, Texas, was at a bar with friends in the island's village of Laganas, popular among tourists and known for its nightlife, when a fight broke out with another group of people in the early morning hours of July 7. The fight escalated into a brawl outside the bar and Henderson was battered to death in the street, according to police in Zakynthos.

Pavlos Kolokotsas, the mayor of Zakynthos, told ABC News that both groups involved had been drinking extensively.

An autopsy on Henderson's body was completed this week. The coroner told ABC News that the young man suffered severe head injuries in the incident. All of the strikes were to the head and there did not appear to be any defensive wounds on his body.

While it could not be determined exactly when Henderson died, the coroner told ABC News that he was pronounced dead at a local hospital.

Henderson's body was transported to Athens and then to the United States within two days of the completed autopsy. A toxicology report will be released in several weeks, the coroner said.

Surveillance footage from a nearby security camera, which was shared with ABC News, appears to show Henderson being pursued by a group of people as he runs down a sidewalk. One man appears to tackle Henderson and throw him onto a parked car, while the others join in the beating. A large crowd remained on the sidewalk for several minutes after the violent commotion.

PHOTO: Surveillance video shows a brawl on the Greek Island of Zakynthos where American Bakari Henderson, 22, was killed, July 7, 2017. (Proto Thema) More

Suspects facing intentional homicide charges

Nine men -- one Greek, seven Serbs and a British citizen of Serb origin -- have been arrested so far and are accused of intentional homicide. The investigation is ongoing and authorities are searching for six more suspects identified from the surveillance footage, police said.

Four of the men arrested, all Serb nationals, appeared before a judge Thursday for initial testimony regarding Henderson's death. Two of them were released on bail, which was set at 5,000 euros, or about $5,700, each. One was ordered to remain jailed pending trial, and the fourth was granted a postponement and is scheduled to testify Friday, according to police.

The other five were jailed pending trial after 12 hour-long testimonies in court Wednesday, police said.

No trial date has been set.

An attorney for one of the nine arrested told ABC News that his client has no criminal record. The lawyer admitted his client caused some bodily harm, but said he didn’t have homicidal intent and didn’t hit Henderson in the head. He said his client is "devastated, literally devastated."

"He did not hit [the victim] on the head, and death was caused by traumatic head injury," the attorney said. "I am convinced that it will be proven that he was not the one who caused the death of the unfortunate American."

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PHOTO: Zakynthos town and harbor in Greece is pictured at dusk in this undated stock photo. (Getty Images) More

Friends, family struggling to cope

Friends of Henderson who were in Greece with him told ABC News that the suspects were "looking for a fight" and punched Henderson first. Henderson attempted to get away from the mob during the brawl and became separated from his friends, they said.

By the time they made it back to him, the attackers had dispersed and Henderson was lying on the ground, the friends said.

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