Sri Lankan President Sirisena and Prime Minister Wickremasinghe have ordered police to uphold the law, but the violence against Muslims has not ended.
Residents still say around 100 people may be missing, but the state-run Disaster Management Centre revised down its own figure for the missing to 11 from an initial 30.
The UN and rights groups have accused the Sri Lankan military of killing thousands of civilians, mostly Tamils, during the final weeks of the civil war.
Colombo’s plans to acquire land for the industrial zone have run into stiff domestic opposition, backed by former President Mahinda Rajapaksa.
Hundreds of Sri Lankans clashed with police at the opening last month of the industrial zone in the south, saying they would not be moved from their land.
The parliamentary vote endorsed the exit, but it was approved by only 39 lawmakers while 19 voted against, including six from Yameen’s own party.
Dilrukshi Wickramasinghe resigned on Monday after President Maithripala Sirisena implied her agency was favouring the rival party of his prime minister.
The Maldives United Opposition denounced the trial as flawed and “deeply unfair”, claiming that it was politically motivated.
The Office of Missing Persons (OMP) will have investigative powers and will probe people who went missing in the conflict and political unrest, including “enforced” disappearances.