Poland's prime minister said that Warsaw would put on ice plans to ratify a controversial international online anti-piracy accord after massive off-and-online protests in his country.

"I consider that the arguments for a halt to the ratification process are justified," Donald Tusk told reporters.

"The issue of signing of the ACTA accord did not involve sufficient consultation with everyone who is part of the process," Tusk said, adding that he would hold broad talks on what to do next.

"The ACTA ratification process will be frozen as long as we haven't overcome all the doubts. This will probably require a review of Polish law. We can't rule out that, at the end of the day, this accord will not be approved."

Tusk's decision comes in the wake of high-profile protests mostly by young Poles who fear the Anti-Counterfeiting Trade Agreement (ACTA) - aimed at creating international standards for intellectual property protection - could significantly curtail online freedom.