Turkish news agency Dogan said that at least 20 people have been killed. TV footage shows scenes of panic and people lying on the ground covered in blood, amid protest banners.
The blasts took place near the city's central train station.
The target appears to have been a march calling for an end to the violence with the Kurdish separatist group, the PKK.
Kurdish Question adds:
One of the two explosions occurred during the passage of Peoples' Democratic Party (HDP) demonstrators who had just started marching, and the other during the passage of pro- Partizan-Kaldıraç demonstrators.
Bodies of the casualties have been covered with the flags and banners carried by the people who had gathered to demand peace today against the ongoing war and conflict in the country.
In the meantime, police have fired tear gas amid the crowd at the scene where bodies of many have people have scattered around in a blood bath.
There has been a long standing conflict between the ultra nationalist Turkish state it's large Kurdish population. President Erdogan's turn to Islamic fundamentalism has exasperated the situation seeing both far-right currents coming into further conflict with the Kurds.
The regime claims that a suicide bomber was involved in one of the explosions. However the leader of the Kurdish HDP has accused the government of being involved.
This attack comes at a dangerous time in the middle east as the involvement of Russia in a renewed Assad offencive could spark further dangers in the now autonomous Kurdish areas of Syria.
The world must demand a place for Kurds to live in peace and demand the Turks cease their conflict with the PKK.
For a free independent and democratic Kurdistan!