Explosion at Blue Route Mall

Five people have been seriously injured during an explosion at Spur.

Five people were taken to hospital following an explosion at Blue Route Mall in Retreat in Cape Town. Picture: Nizaar Marlie.

CAPE TOWN - Five people have been rushed to hospital following an explosion at Blue Route Mall in Retreat in Cape Town.

Officials first thought the blast at the Spur Restaurant was caused by a gas leak.

But City and Fire Rescue Service's Theo Layne says it was a dust explosion.

"It wasn't a gas explosion. It was a dust explosion as a result of an accumulation of dust over a number of years."

Shoppers have been allowed back inside the mall while authorities investigate.