UN Secretary General Ban Ki-moon declared that he was "shocked" after Hungarian police fired tear gas and water cannon to force migrants back from its border, BBC reports.
According to Ban Ki-moon such treatment of asylum seekers was "unacceptable."
Hundreds of migrants were involved in the clashes at the border between Hungary and Serbia, after Hungary closed its entire border with Serbia preventing migrants from entering the country or damaging the border fence.
In their defense officials of Hungary noted that 20 police officers were injured as migrants tried to break through a gate, and a spokesman accused migrants of using children as "human shields."