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However, the country manager of Taqa Arabia, an Egyptian company that runs the filling station near the airport, sees the growing demand as a "positive sign that CNG use has started to develop in Tanzania".

The fuel leak is from a petrol filling station owned by Asda, which said it inherited the problem when it bought the site.

Footage from the area showed a filling station and rest stop almost completely destroyed, with twisted metal littered over damaged vehicles.

The filling station stands at the treeless, windswept intersection of Highways 46 and 33, on the well-trodden path between the Central Coast and the San Joaquin Valley.

To keep them alive, Mr. Mwafi says he wakes up at 4 a.m., spending hours waiting for water at a crowded filling station.