Police on both sides of the Border are investigating after the directors of Quinn Industrial Holdings in Derrylin received a threatening message last week.

In a written warning the management of Sean Quinn's former businesses were warned that a "permanent solution" could be implemented for at least one of them.

A spokesman for QIH told this newspaper: “I can confirm that QIH received threatening correspondence last week which has been passed on to the PSNI and Gardaí.

"As with prior intimidation the latest correspondence is anonymous and entirely disconnected from the success of the business locally which recently announced record profits and investment," he said.