The Nigeria Police Force (NPF) on Friday vacated the premises of the Akwa Ibom State House of Assembly.
All entrances to the complex had been barricaded since Tuesday morning.
The Assembly had been cordoned off by armed police personnel on Wednesday following a crisis that erupted on Monday.
Speaker of the Assembly, Onofiok Luke, had declared the seats of five lawmakers who had defected from Peoples Democratic Party (PDP) to the All Progressives Congress (APC), vacant, a situation which later led to alleged thugs disrupting plenary.
The police, thereafter, sealed off the complex, denying the lawmakers and staff of the Assembly access.
Concise News reported that the Senate had ordered an investigation into the sealing of the Assembly after the issue was raised by Senator Bassey Akpan, representing Akwa Ibom North-East.
The Senate also ordered the police to immediately vacate the assembly and not prevent legislators from getting in.