Turkish Prime Minister Ahmet Davutoglu said in comments published Saturday that two explosions at a Kurdish party rally which killed two people just days before key parliamentary elections, were acts of sabotage and provocation.

"A dirty hand is involved, this dirty hand has to be exposed," Davutoglu said.

Turkey holds parliamentary elections on Sunday in which the Kurdish votes will be crucial in determining whether the ruling party gets the supermajority it seeks.

The ruling AKP party wants a large majority that would allow it to change Turkey's constitution and transfer the prime minister's executive powers to President Recep Tayyip Erdogan in a new presidential system. If the Kurdish party gets a minimum 10 percent of the votes required to take seats in parliament, it would effectively block that possibility.

Officials have not confirmed whether the blasts at the People's Democratic Party rally Friday in the mainly Kurdish city of Diyarbakir was caused by bombs. But the private Dogan news agency, without citing sources, said Saturday that one of the explosions was caused by explosives placed in a gas cylinder and fortified with pieces of metal.

"The investigation is continuing but it is clear that it is sabotage, a provocation and an incident of violence," Davutoglu said in a late-night interview on NTV television. His words were carried by the state-run Anadolu Agency Saturday.

Davutoglu did not point to anyone as responsible for the incident but said the ruling AKP should not be blamed.

"If accusations are made even implicitly, I will react to them in a clear and open way," Davutoglu said.

The HDP campaign has been the target of other attacks, including bomb explosions at two local party headquarters which injured six people last month. The HDP has accused Erdogan of making the party a target by constantly speaking against it in the campaign.

A prosecutor said Friday that about 100 people were injured at the rally, mostly in the panic after the blasts.