"The number of casualties among German citizens, unfortunately, has grown to 10 people," Sawsan Chebli told reporters in Berlin.
According to German media reports, the majority of victims are pensioners from one tourist group.
A powerful bomb exploded on Tuesday morning near Sultanahmet Square in the heart of Istanbul close to a tram station, when there was a group of tourists, claiming the lives of 10 and injuring 15 more.
Turkish President Recep Tayyip Erdogan said the attack was perpetrated by a Syrian suicide bomber. Turkey’s Prime Minister Ahmet Davutoglu stated the suspect was a member of Daesh terrorist group, outlawed in Russia.