Turkey's pro-Kurdish party described an Isil attack on the Syrian border town of Kobane as a massacre and blamed it on Turkish state support for the militants, comments which will fuel tension in Ankara amid attempts to form a government.
Isil fighters launched simultaneous attacks against the Syrian government and Kurdish militia overnight, with at least one car bomb in an area near the border crossing with Turkey.
Hospital officials said at least 15 people were killed and 70 wounded.
"The Turkish government has supported Isil for years. Today's massacre is a part of this support," said Figen Yuksekdag, the co-leader of the People's Democratic Party (HDP).
The pro-Kurdish HDP entered parliament for the first time after clearing a 10pc threshold in the June 7 elections.
Its success helped to deprive the governing AK Party, founded by President Tayyip Erdogan, of a majority for the first time in over a decade.
The AKP now needs to find a coalition partner.
"The remarks of Turkish politicians are null and void for us.
"It is up to the Turkish government to prove it does not support Isil," she added.
Turkey, a Sunni Muslim nation with a secular constitution, is a member of the US-led coalition against Isil, although its partners have urged it to do more.
Yuksekdag also told reporters there was a "high probability" that the attackers yesterday had entered Kobane from Turkey. Ankara has denied such allegations and said the attack was staged from Jarablus, to the west of Kobane.