Mr Buhari's office later said that the president had been informed about "the tragic deaths of several members of his All Progressives Congress (APC) party in a stampede".
Responding to allegation the Minister of Information and Culture Lai Mohammed the PDP was planning to disrupt the general elections, the opposition party said it was a fresh attempt by the government to use its chief propagandist to level false allegations.
President Muhammadu Buhari's party has issued a stern warning to the United States and other foreign allies for allegedly making "unguarded" public statements ahead of Nigeria's presidential polls this weekend.
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Keyamo's comments come after a key Buhari ally, Kaduna state governor Nasir El-Rufai, said outsiders who intervened in the election "will go back in body bags".
"Lai Mohammed has nothing to say to the Director General of the Buhari Campaign Organization, Rotimi Amaechi, who raised a war chant and threatened Nigerians at the APC presidential rally in Port Harcourt on Tuesday".
Buhari's re-election campaign spokesman Festus Keyamo called the statements from the USA and others "notably off-key" and unwelcome.
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Nigerians are all aware that the PDP is ready and working hard for this election.
"We invite the world to note that this latest assault against the people's candidate is also borne out of direct ill-will and hatred against him by President Muhammadu Buhari as well as his handlers, who have sought all ways to drag him down, since they realised that Nigerians have reached a consensus on Atiku Abubakar, as the next president of our country".
Saturday's election will see Buhari stand for a second four-year term against former vice-president Atiku Abubakar in what is expected to be a close race.
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"However, any further attack on our campaign will therefore attract very dire response from Nigerians who look up to Atiku Abubakar to salvage our dear nation from the social, economic and political despondency, which President Buhari has plunged her into".