Meanwhile, the European Union observation mission to Nigeria says soldiers barred them from monitoring elections in Rivers State.
The observers made the allegation in their preliminary report in Abuja.
Addressing journalists, the Chief Observer, Maria Arena, noted that they came to Nigeria on the invitation of INEC to monitor the elections and make recommendations.
Miss Arena lamented the violence, underage voting and vote-buying that marred the governorship and house of assembly elections in some states.
She observed that the infractions evident in the 2019 electoral process had shown that there was a need for an inclusive national discussion on reforms for greater electoral integrity and participation.