The death toll from a petrol tanker explosion in central Liberia has risen to 74, the West African nation’s chief medical officer said Monday. The new figure is sharply up on the previous toll of 40 dead from the December 26 disaster.On Sunday, President George Weah declared a national week of mourning for the victims and their families.“The present toll is over 70 that have died,” Francis Kateh, Liberia’s chief medical officer, told AFP on Monday. Source