Originally built in the 1960s, the Salang Tunnel is around 80 miles (128.7 kilometres) north of Kabul. The fuel tanker explosion killed at least 19 people, among them women and children.
Pakistan's Oil and Gas Regulatory Authority has held that Shell's subsidiary was responsible for the blast in Punjab province on June 25 that killed more than 200 people when one of its tankers overturned.
At least 38 people have been killed and 28 injured in Afghanistan after a bus collided with a fuel tanker.
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