The five-person commission, led by Prof Evelyn Collins, held face-to-face talks with the Orange Order earlier this week, and held a separate meeting with the residents’ coalition.

Senior police officers were also consulted about the planned parade.

Within the 31-paragraph determination by the Parades Commission, details were revealed of conversations held with the PSNI.

The document stated: “The police made both written and oral submissions, indicating that they, at the time of making them, had no information indicating that the parade would result in disorder or violence.”

The Police Service of Northern Ireland (PSNI) said it had activated “mutual aid arrangements to support contingency planning for a policing operation” in Portadown on Sunday.

It is understood about 200 officers are coming from Scotland.