EnuguGunfire scattered Nigeria Democratic Congress supporters at the airport.
Video clips show a man in army uniform standing beside an attacker as he beat a supporter.
The attackers struck again at the party secretariat during the campaign flag-off, where police operatives were seen shooting at suspected thugs.
Supporters accuse police and army personnel of complicity, which has not been independently verified.
Police spokesperson Daniel Ndukwe had not answered questions on arrests or injuries by filing.
How each outlet framed it
- Premium Times Nigeria leans critical
- documents the army-uniformed bystander who did nothing as a thug beat an NDC supporter with a plank, from the video clips
Sources: Premium Times Nigeria