A gang of armed robbers stormed the Offa ancient city in Kwara State late Thursday where they raided five banks, killing six policemen and six civilians.
Eye witnesses said that the robbers, about 30 of them blocked the Offa-Oshogbo Road in a commando-like manner and shot repeatedly to passersby.
It was gathered that they blew up the banks with explosives and carted away millions of naira.
Among the civilians killed in the raid was a pregnant woman who had come to one of the banks on a business transaction.
The affected banks included Ecobank, GTB, Zenith, First Bank and Union Bank.