Television broadcast and social media images showed thousands of people gathered at a stadium in Jalingo displaying support to Buhari at a campaign ceremony attended by senior politicians.
Buhari has expressed sadness over of loss of lives at the rally in a statement.
He expressed appreciation over massive support he had been receiving all over the country, and called for restraint on the part of his supporters to avoid such tragic incidence, and improved crowd management at rally grounds.
"I want them to stay alive and witness the dividends of purposeful governance that the APC administration will unfold when they renew our mandate," he added.
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