The incident happened at the secretariat of the All Progressives Congress (APC) in Auchi as the deputy governor was receiving a delegation.
The attack took place a few minutes after Governor Adams Oshiomhole and Odubu left a party organised by Damian Lawani, representative of the Estako Central Constituency in the House of Assembly.
The gunmen reportedly invaded the secretariat and opened fire on the deputy governor and others at the meeting.
Five persons were said to have been critically injured, including the Guard Commander of the Deputy Governor’s Police team who covered his boss during the invasion.
Six delegates and three security details attached to Odubu are said to be in critical conditions.
They are receiving treatment at Faith Medical Centre in Auchi.