Hi it was not in Antalya but the rural district of Manvagat. The area is located about 100 km (60 miles) east of Antalya city.

The blast which occurred near a restaurant at the Manavgat waterfall, east of Antalya city

http://www.turkishpress.com/news.asp?id=130331

Such a sad event but do not let these events put you off from travelling to Turkey it is still very safe.

Hello again, this morning while watching the news it was reported that the
explosion was due to a propane gas tank leak in a local kitchen.

Propane is sometimes unstable and can be a factor with car explosions. Many people use or add propane to their automobiles unstead of gas because it is cheaper.