Turkish firefighters on Sunday battled a huge fire which broke out in a warehouse storing chemicals used in paint making on the outskirts of Istanbul, Anatolia news agency reported. The blaze was sparked by an explosion at Dilovasi, an industrial zone 40 kilometres (25 miles) from the city centre. Teams of firefighters were trying to prevent the fire spreading to tanks of other chemicals in the vicinity, the agency said, adding that there were no immediate reports of casualties. 