A Turkish activist who was aboard the Global Sumud Flotilla has said that Israeli forces subjected Swedish climate activist Greta Thunberg, also a mission participant, to severe torture after vessels were seized in international waters.

Ersin Celik, who was among those detained and arrived in Istanbul on Saturday, told CNN Turk that Israeli soldiers subjected Thunberg, 22, to degrading treatment while in custody.

“They (Israeli forces) severely tortured Greta before our eyes,” Celik said. “They persecuted her — Greta is just a little child. They made her crawl and made her kiss the Israeli flag. They did exactly what the Nazis did once.”

“They displayed her publicly. And because she is a popular figure, they specifically targeted her.”