"Having spoken to both parties, therefore no internal investigation," they told Metro.co.uk.
In addition, the corporation explained that Piers is "known for engaging in heated exchanges, when criticism is levelled against him".
They further explained: "In terms of the separate issue of social media exchanges, we understand some producers wish to express their views on their personal platforms, and we also think it is widely understood that Piers is a prolific and long-standing user of social media where he is well known for engaging in robust, heated exchanges, when criticism is levelled against him.
Piers Morgan reacted to the open letter on Twitter (Image: ITV)