Eleven people have died in a stampede at an election rally in Nigeria.
The rally in the southern city of Port Harcourt was part of President Goodluck Jonathan's election campaign ahead of a poll due in April.
Thousands of ruling party supporters crowded into a sports stadium to hear Jonathan speak and hundreds more gathered around the gates.
There was a stampede after a policeman fired into the air to try to disperse the crush as people left, according to witnesses.
President Jonathan has ordered an investigation and said the incident was "sad, unfortunate and regrettable," adding: "I mourn with those who mourn."
"There was a huge crowd, the place was completely full," Ken Saro-Wiwa, President Jonathan's special assistant on international affairs, said.
"It is a sad end to what had been a great day," said Mr Saro-Wiwa.
President Jonathan, whose People's Democratic Party have won every presidential vote since the return to civilian rule in 1999, is favourite to win April's election.
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