Turkish investigators are working to identify the perpetrators and victims of yesterday's bomb blasts as the country mourns the most deadly attack of its kind on Turkish soil.
A pro-Kurdish opposition party today said that 128 people had been killed in the attack on a peace rally in the capital, Ankara.
The prime minister's office yesterday said at least 95 people had lost their lives.
Two suspected suicide bombers hit the rally of pro-Kurdish and labour activists near Ankara's main train station, three weeks before elections.
The attack fuelled unease in a country beset by conflict between state forces and Kurdish militants in the southeast.
Three days of national mourning declared by the prime minister are under way.
Two senior Turkish security sources have said initial indications suggest that the so-called Islamic State group was responsible for the attack.
One of the bombers had been identified as a man aged between 25-30 after the analysis of bodies at the scene and fingerprints, the pro-government Yeni Safak media said.
The attack comes as external threats mount for NATO member Turkey with increased fighting across its border with Syria and incursions by Russian warplanes on its air space over the last week.
Prime Minister Ahmet Davutoglu had previously said that IS, Kurdish or far-leftist militants could have carried out the bombing.
His office named 52 of the victims overnight and said autopsies were continuing.
It said 246 wounded people were still being treated, 48 of them in intensive care.
"The necessary work is being conducted to identify those behind the attack and quickly bring them to justice," according to a statement.
The two blasts happened seconds apart yesterday morning as crowds, including pro-Kurdish Peoples' Democratic Party (HDP) activists, leftists, labour unions and other civic groups, gathered for a march to protest over the deaths of hundreds since conflict resumed between security forces and the Kurdistan Workers' Party (PKK) in the mainly Kurdish southeast.
Hours after the bombing, the PKK as widely expected beforehand ordered its fighters to halt operations in Turkey unless they faced attack.
It said it would avoid acts that could hinder a "fair and just election" on 1 November.
