Mr Igbokwe said security cameras captured the arsonists arriving in a vehicle at his residence in the commercial Anambra town.
The shutdown of telecom signals came days after Governor Bello Matawalle banned the transportation of food items and restricted the movement of commercial motorcycles.
Mr Mamman was fired on Wednesday.
The interviews had been scheduled for 8:00 a.m. and many of the doctors had been arriving at the venue as of 5:30 a.m., a doctor said.
Yusuf Buhari, 27, a graduate of the University of Surrey in the United Kingdom, wedded Ms Zahra, 19, in Kano, on Friday.
The opposition leader chaired the launch of a new book by journalist Chido Onumah in Abuja on Thursday.
Mr Okupe, a former presidential spokesman said he is best prepared to become Nigeria’s president in 2023 as he suits IBB’s criteria perfectly.
Twitter told The Gazette on Wednesday that it had not reached any agreement with the Buhari regime yet.
Osinbajo has praised a professor of Business Administration who criticised some Nigerian youths for lacking integrity and being fraudulent.
The federal government has imposed a generator tax on banks because of its pollution to the environment and danger to Abuja residents.