 At least 24 people have been killed during a strong explosion in a gas truck in Mongolia's capital Ulan-Bader, Central Asia publication reported. The truck was carrying 60 tons of gas. The explosion has been caused by a road accident. The blast was followed by fire that is spread to a residential building in market in the R. The explosion has been felt as far as hundreds of meters away from the epicenter. According to preliminary reports, among the killed are three firefighters. The casualty toll has yet to be confirmed by the country's officials.