Turkey said today it had arrested one person in connection with a deadly suicide bombing that ripped through the historic heart of Istanbul, killing 10 German tourists and raising alarm over security in the country.

Ankara has said that yesterday's attack was carried out by a 28-year-old Syrian who belonged to the Islamic State (IS) group and had recently entered Turkey from Syria.

One person was arrested yesterday in connection with the bloodshed, Interior Minister Efkan Ala said today, without explaining the suspect's role in the strike. Turkish security forces over the last two days rounded up 68 suspected IS members across the country, state media said, but it was not clear if any of them were directly connected to the Istanbul bombing.