Speaking in the town of Kilis near the border with Syria, Erdogan said the Syrian leader was responsible for the deaths of some 600,000 of his own citizens and was the root cause of the war in Syria.
"He is a more advanced terrorist than a terrorist from the PYD or the YPG," Erdogan said. "He is a more advanced terrorist than Daesh." Erdogan was referring to Syrian Kurdish militia, which Ankara accuses of being a terror organization because of their affiliation with Turkey's Kurdish rebels, and to the IS group by its Arabic name.
Turkish authorities have detained at least 24 people in raids in several Istanbul neighborhoods over possible connections to the attack. Seventeen other people were detained in the province of Gaziantep, the state-run Anadolu Agency reported.
Erdogan paid an unannounced visit to the airport on Saturday, saying a prayer in front of a memorial set up for the victims, which features the pictures of airport employees killed in the rampage.
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Erdogan said countries he did not name were supporting the Syrian Kurdish militia and the IS in a bid to prevent democracy in Syria and for their "dirty calculations" in the region. He also announced that his government would allow Syrian refugees in Turkey to take on Turkish citizenship.
Turkey has been accused of long turning a blind eye to jihadi fighters who crossed into Syria from Turkish territory in the hope that they would hasten Assad's downfall. Turkey has also been accused of not doing enough to fight IS, despite allowing the US-led coalition to use a key air base to conduct air strikes against jihadists.