"This man [suicide bomber] wasn’t under the supervision and suspicion of police. He arrived in Turkey as a refugee. After this attack, all his connections are being investigated," Davutoglu stated at a briefing in Istanbul, aired by the CNN Turk.
Earlier, Turkish President Recep Tayyip Erdogan said the assault was perpetrated by a Syrian suicide bomber.
Meanwhile, Turkish media, citing a source in the police reported the attacker had Saudi citizenship and was trying to get a political asylum in Turkey.
A total of five individuals were arrested in connection with a suicide bombing in the Turkish largest city, according to the country’s authorities.