It added that five U.S. soldiers joined in after seeing the incident, and that police intervened. All 15 attackers had been detained and an investigation was launched into the matter, it said.

The U.S. Embassy to Turkey confirmed the attack and said the U.S. soldiers were now safe.

"We can confirm reports that U.S. service members embarked aboard the USS Wasp were the victims of an assault in Izmir today, and are now safe," it said on social media platform.

Earlier, the TGB posted a video on X showing a group holding down a man on the street and putting a white hood over his head, while shouting slogans.

The group said the man was a soldier on board the USS Wasp, an amphibious assault ship. The U.S. Embassy in Ankara had said earlier on Monday that the ship was carrying out a port visit to the Aegean coastal town of Izmir this week.

"U.S. soldiers who carry the blood of our soldiers and thousands of Palestinians on their hands cannot dirty our country. Every time you step foot in these lands, we will meet you the way you deserve," TGB said.

The group said the man was a soldier on board the USS Wasp, an amphibious assault ship. The U.S. Embassy in Ankara had said earlier on Monday that the ship was carrying out a port visit to the Aegean coastal town of Izmir this week.