"A further complaint was also made by ITN CEO John Hardie, which fully supports and endorses the grounds and reasoning of Fatima's complaint.
"ITN accepts and understands that our reporters and presenters are in the public eye and can expect criticism and comment from many quarters, including newspaper columnists. What it cannot accept is an employee being singled out on the basis of her religion.
"We are not going to simply stand by when an employee is subject to an act of religious discrimination."
Monday's column by Mr Mackenzie sparked more than 1,700 complaints to Ipso and drew scorn from MPs in the House of Commons.
In his column he claimed "I could hardly believe my eyes", and asked: "Was it appropriate for her to be on camera when there had been yet another shocking slaughter by a Muslim?"
At the time Channel 4 described his comments as "offensive, completely unacceptable, and arguably tantamount to inciting religious and even racial hatred".
