(http://news.bbcimg.co.uk/media/images/71830000/jpg/_71830072_pdp_afp.jpg) It is not clear if President Jonathan will seek re-election next year Heshimu Suleiman, one of the governor's supporters, said the attack was politically motivated to punish Mr Kwankwaso for defecting, reports the AP news agency.
The PDP has not yet commented on the allegation.
In December, Nigeria's ex-President Olusegun Obasanjo said it would be "morally flawed" for Mr Jonathan to seek re-election next year.
He said Mr Jonathan had failed to tackle Nigeria's many problems, including corruption and an insurgency led by the militant Islamist group Boko Haram.
Mr Jonathan defended his record in government, but has not yet declared his candidature.