Istanbul explosion
Police forensic experts work on the scene of an explosion in central Istanbul, TurkeyMurad Sezer/ Reuters

Turkish Prime Minister Ahmet Davutoglu said Isis is behind a suicide attack in Turkish capital Istanbul in which ten people were killed.

Authorities said that ten were killed and five injured in the attack in Istanbul's historic Sultanahmet Square. Nine of those killed in the attack in were German, German media reported, citing government sources.

Davutoglu, according to Associated Press, proclaimed that Turkey was determined to battle the extremist group until it no longer "remains a threat" to Turkey and the world.

In the wake of the attack there have been conflicting reports on the nationality of the bomber, with Turkish President Recep Tayyip Erdogan claiming that a 28-year-old Syrian man was responsible, while the Dogan news agency reported that the attacker had been identified as a Saudi Arabian Nabil Fadhli.

Turkish Deputy Prime Minister Numan Kurtulmuş said that the bomber had recently entered Turkey from Syria and was not on a watch list of known militants.

In 2015, Isis was responsible for several deadly suicide bombing attacks targeting Kurdish political protests in southern Turkey and in the capital, Ankara.