Istanbul bomb blast

Ahmet Davutoglu was elected Chairman of Turkey's ruling Justice and Development Party (AK Party) on Wednesday

Outgoing Foreign Minister Davutoglu, who was the only candidate to replace President-elect Recep Tayyip Erdogan, was elected with the votes of 1382 delegates at an AKP congress in Ankara, the remaining six votes being invalid, according to reports of Today's Zaman.

More than 20 people have been injured and tens have been detained in Istanbul during May Day protests.

Episodes of unrest began after police used tear gas and water cannon to warn citizens against staging a banned demonstration on Taksim Square, which saw a wave of anti-government action last year.