Wiz Khalifa faces backlash for visiting Colombian drug lord's grave

US rapper Wiz Khalifa has angered Colombians by publishing photos of himself visiting the grave of the notorious drug lord Pablo Escobar in the city of Medellin.
    
Escobar terrorised Colombia in the 1980s and 1990s, bribing, kidnapping or killing all those who stood in his way.
    
Medellin Mayor Federico Gutierrez said Wiz Khalifa should apologise for advocating crime.
    
He said Wiz Khalifa should have brought flowers to Escobar's victims instead of placing them at the drug lord's grave.
    
Pablo Escobar and his Medellin cartel are held responsible for about 4,000 killings, including the bombing of an airliner in which all 107 people on board were killed.