In May, an explosion at a factory in the port city of Takoradi occurred as a tanker was discharging liquefied petroleum gas at the Ghana Household Utilities Manufacturing Company factory.
Dr Bawumia, who visited some hospitals that received the casualties including the Legon, 37 Military, Ridge and the Police hospitals, extended condolences to the bereaved families, and wished those who had been injured speedy recovery.
The massive explosion occurred at the MANSCO gas station at Atomic Junction near the University of Ghana, resulting in a blackout and sparking widespread pandemonium in surrounding areas.
Billy Angalatey, spokesman, Ghana national fire service, said: "As we speak, six people are dead due to this fire".
Frightened residents ran from the explosion, which sent a giant fireball high into the sky above the city, and several fire trucks and ambulances were deployed to the scene. "There are lots of buildings and a lot of people in the area, including many street sellers".More news: Dove apologizes for 'racist' Facebook ad
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The blasts will likely revive memories of June 2015 when more than 150 people were killed as they sought shelter from seasonal rains and flooding at a petrol station.
Homes have been evacuated around the city. Almost 1 500 people had signed it by late morning on Sunday.
Ghanaians have been reacting to the fire on Twitter.
Nkrumah said regulations already existed about the siting of fuel stations but the initial focus of the authorities was taking care of those injured in the incident.