Story highlights President Recep Tayyip Erdogan names three opponents of his government

Southeastern Turkey has been wracked by explosions this year

Istanbul, Turkey (CNN) The Turkish President declared ISIS as the "likely perpetrator" of an attack that killed 50 people at a wedding in the nation's southeast.

The death toll from the Gaziantep attack rose to 50 early Sunday, according to the local governor's office.

President Recep Tayyip Erdogan said there is "no difference" between three opponents of his government: terror group ISIS, which is based in neighboring Syria; the outlawed Kurdistan Workers Party (PKK); and FETO, the network of US-based cleric Fethullah Gulen , state-run Anadolu news agency reported Sunday.

Erdogan accuses Gulen of being behind a recent coup attempt. He has denied the accusation.

No group has claimed responsibility for the attack, which also injured 94 others.

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