Ambulances are heading to the scene; the number of victims is unknown.
Yesterday, the explosion took place at a military housing complex near the Turkish parliament building in Ankara. A fire then broke out at the site of the explosion. At least 28 people were killed and over 60 were injured.
Turkish Prime Minister Ahmet Davutoglu cancelled his visit to Brussels in the wake of the attack.
No group has claimed responsibility for the blast so far.
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