The suicide bombings that killed at least 97 people and wounded over 500 at a peace rally in Ankara, Turkey last Saturday have been officially linked to the Islamic State, according to Turkish officials.

The Guardian reported on Monday that Turkish officials said there was “concrete evidence” to link ISIS to the attacks, which were considered the deadliest terror attack in Turkey’s history. The country’s prime minister, Ahmet Davutoğlu, echoed the sentiments on NTV television earlier on Monday.

“If you consider the way the attack happened and the general trend of it, we have identified Islamic State as the primary focus.”

Turkish officials are now using DNA testing to help identify suspects as well as examining footage of Ankara over the past week.

The bombings, which occurred three weeks before the country’s snap elections on November 1, come after a bombing on the Syrian border which killed 33 people, most of them Kurdish activists, just months before. That bombing was also blamed on ISIS forces.

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