The stampede occurred before dawn yesterday at an All Saints' Day open-air vigil organised by St. Dominic's Catholic Church in the town of Uke, according to the deputy inspector general of police, Emmanuel Kachi Udeoji.
Dr Peter Katchy of the local Red Cross chapter said they had a mobile clinic and small emergency station posted at the grounds because more than 100,000 people had gathered for very popular healing sessions by a local priest.
Katchy blamed "an over-large crowd and lack of crowd control."
Newspaper and TV reports blamed politicking for the Nov. 18 elections.
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They quoted witnesses as saying the false warning of a fire was made to try to end a speech being made by Gov. Peter Obi, who attended the crusade and was booed as he tried to promote his gubernatorial candidate.
The name being shouted was that of a rival for the governorship, Sen Chris Ngige, witnesses said on the TV. Some said Obi's bodyguards charged into the part of the crowd from which the catcalls had ensued, causing the stampede when someone shouted there were armed men attacking them. Other witnesses said the way out was blocked by protesters chanting slogans against Obi and in support of Ngige.