Turkish officials have said a man was fatally wounded when Greek security forces opened fire as migrants gathered at the border on Wednesday.
Greece immediately issued a flat denial, saying it was not involved in any such incident involving gunfire.
Thousands of people have headed to the border after Turkey said it would no longer stop migrants crossing.
Greece has also denied claims that two Syrians were fatally shot while trying to cross the border last night.
It might help if Turkey was not forcibly bussing migrants to the Greek border and enabling them to cut through the wire.
Athens claims Turkish police are firing tear gas “to help migrants cross border”