An opposition rally in southern Nigeria has been hit by explosions and gunfire, reports say.
The blast occurred at an All Progressives Congress rally at a school in Okrika in Rivers state, local media said, ahead of elections on 28 March.
Members of the APC - Nigeria's main opposition - were reportedly waiting for their leaders to arrive at the venue when the incident occurred.
It was not immediately clear who was responsible for the attack.
There were several explosions while APC members waited for the rally to begin, witnesses said, followed by gunfire.
People fled the rally in Okrika - a small port town south of Port Harcourt, in the heart of Nigeria's oil-producing region.
"We have been attacked," a spokeswoman for Rivers State governor Rotimi Amaechi told AFP news agency.
Mr Amaechi was not at the rally.
On Monday, the Nigerian Human Rights Commission said at least 58 people had been killed in the country in pre-election violence.
The elections were postponed from 14 February to 28 March over security concerns in the north-east, where militant Islamist group Boko Haram is waging an insurgency.
APC candidate Muhammadu Buhari is President Goodluck Jonathan's main challenger in the election.
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