Boksburg

The leak of what authorities said was a toxic nitrate gas happened Wednesday night in the informal Angelo settlement in Boksburg, a city on the eastern outskirts of Johannesburg.

Boksburg is the city where 41 people died after a truck carrying liquefied petroleum gas got stuck under a bridge and exploded on Christmas Eve.

Investigations were underway to determine what type of gas was involved in the Wednesday accident, Gauteng Province Premier Panyaza Lesufi told reporters as he visited the scene near Boksburg, just east of the city of Johannesburg.

A gas tanker explosion in Boksburg in December killed dozens of people, injured scores and destroyed houses and vehicles.

An emergency official said the deaths resulted from a leak in a cylinder of gas at the encampment, called the Angelo informal settlement, near the South African city of Boksburg.