Pazarkule border crossing near Edirne, Turkey (CNN) Several migrants attempting to cross from Turkey to Greece told CNN over the past week that Greek security forces took their documents, money, phones and clothes before sending them back to Turkey in their underwear.

CNN has obtained a video showing men in their underpants arriving back on Turkish soil, allegedly sent back through Evros River, with no clothes by Greek security forces. The river, known as Meriç in Turkey, forms the natural border between both countries.

The video was captured by Turkish state broadcaster TRT. CNN cannot independently verify this specific video or circumstances surrounding how it was shot. But human rights groups like Amnesty International have documented dozens of similar refugee testimonies in recent years -- which Greek authorities have repeatedly denied.

CNN has spoken to several men from Syria, Afghanistan, Morocco and Pakistan who said they experienced this violent and degrading treatment by the Greek security forces in recent days.

Abdel Aziz, a 20-year-old tailor from Aleppo province in Syria, told CNN he was beaten up, stripped down to his underwear and had his belongings taken before he was sent back.

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