Know Knowledge's video: Nagorno-Karabakh conflict grows as big cities hit

Azerbaijan's second-largest city, Ganja, has been shelled by Armenian forces, as heavy clashes continue over the disputed Nagorno-Karabakh region. The enclave is officially part of Azerbaijan but run by ethnic Armenians. The self-proclaimed authorities there said they hit Ganja's military airport after Azerbaijani forces shelled the region's capital, Stepanakert. Azerbaijan says no Ganja military sites were hit. More than 220 people have died since clashes began a week ago. Armenia and Azerbaijan went to war over Nagorno-Karabakh in 1988-94, eventually declaring a ceasefire. However, they have never reached a settlement over the dispute. The current fighting is the worst seen since the ceasefire and the two former Soviet republics have been blaming each other.