Five deaths in the last month have sparked fears of "serial killings" targeting suspected sex workers and protests by women activists in the city of Port Harcourt.
Nigeria counts votes in closely-fought presidential election even as voting continues in some units where polling opened late or ballot machines malfunctioned.
The shooting takes place in the town of Omoku about 90 kilometres (56 miles) from the southern oil hub of Port Harcourt.
Oil company's attorney says six Turkish crew members have been released after being held captive for two weeks by Nigerian pirates.
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