A crime investigator directs others among scattered and covered bodies exploded in Boksburg, east of Johannesburg
Of the 18 victims announced on Monday, half were staff working at Tambo Memorial Hospital which suffered extensive damages due to the explosion.
A total of 37 people at the hospital also suffered serious burns.
According to the regional authorities, the gas tanker explosion caused damages within a 500-metre radius.
Images posted on social networks showed a huge fireball under the bridge.
The tanker, which was presumably too high to fit under the bridge, was filled with 60,000 litres of LPG gas.
