"The fact that the explosion took place in Ankara's strategic center reflects a raft of very serious security problems and gaps pertaining to ensuring security in Turkey," he said.
At the same time, he warned against jumping to any conclusions before a thorough investigation into the Wednesday attack is completed.
In any case, this attack confirms that the political turmoil shows no sign of abating in Turkey, according to Erdem.
"It is already clear that it is the ongoing political instability which added significantly to such a horrendous act of terrorism taking place in Ankara's strategically important area," he said.
On Wednesday, a car bomb exploded at a military housing complex near the parliament building in the Turkish capital, killing at least 28 people and injuring 61 more.According to media reports, the bomber was a Syrian national who had allegedly entered Turkey alongside refugees.
The Turkish Foreign Ministry has meanwhile summoned the ambassadors from permanent member states of the UN Security Council following the attack in Ankara. The Ministry officials will hold separate meetings with the ambassadors of Russia, China, the United States, the United Kingdom and France, according to Turkeyish broadcaster NTV.
