Details added (first version posted on 14:18)
Baku, Azerbaijan, July 12
By Rufiz Hafizoglu - Trend:
An explosion has occurred at the entrance to a building located near a tram stop in Turkey's Istanbul city, the country's Haber7 TV channel reported on July 12.
Some four people got injured as a result of the explosion, according to the preliminary data.
Gas leak caused the explosion.