KANO: Four people were killed when two female suicide bombers attacked the Kantin Kwari textile market in Nigeria’s second city Kano, police commissioner Adenerele Shinaba said on Wednesday.

Seven were injured in the blasts, including some traders, the commissioner added.

Separately, Nigeria’s main opposition party on Wednesday began choosing its candidate to run for president next year against incumbent Goodluck Jonathan, who is seeking a second term.

Thousands of delegates from the All Progressives Congress (APC) converged on the country’s biggest city and financial hub, Lagos, to vote on which candidate would go forward to challenge Jonathan.

The front runners are Nigeria’s ex-military ruler Muhammadu Buhari and Atiku Abubakar, a former vice-president.

Jonathan is expected to be formally endorsed as the PDP candidate at a meeting in Abuja, with no other challengers.

Past presidential primaries have run deep into the night before a winner is announced and a result may not come until Thursday.