Gibson Dunn & Crutcher partner Peter Gray "deliberately misled" the High Court when he submitted incorrectly dated evidence, a judge ruled today, as a hearing in a 2013 case between the Republic of Djibouti and one of its wealthiest citizens drew to a close.

Abdourahman Boreh had been convicted of terrorism for his involvement in a 2009 terrorist attack, in part because of the evidence Gray had submitted. But Mr Justice Flaux ruled that Gray knowingly submitted the incorrectly dated evidence.

Flaux also lifted part of a freezing order on Boreh's assets in light of the fact that "Djibouti and its legal representatives deliberately and/or recklessly misled the court in the application for the freezing order".

He added: "No allegation of professional misconduct or impropriety was being made against any other solicitor or lawyer at Gibson Dunn or against leading or junior counsel who acted for Djibouti at the hearing of the application for the freezing injunction and subsequently."

A spokesperson for Gibson Dunn said the firm was "disappointed" that Gray's conduct "fell far below the standard that the court rightly expects of all counsel".

The firm has already referred itself to the Solicitors Regulation Authority in light of the allegations.

The spokesperson added: "As a law firm, we place the highest value on ethical conduct, including honesty, integrity and candour. We have apologised to the court for these shortcomings. The firm had already suspended Mr Gray pending further inquiry."

She also said Gibson Dunn would "continue to represent the government of Djibouti in pursuing its claims in this matter".

Gray was represented by Fountain Court Chambers' Mark Simpson QC, Nico Leslie and James Hart.

Boreh turned to 7KBW's Dominic Kendrick QC and Keir Howie and Essex Court Chambers' James Willan, instructed by Byrne & Partners' Yvonne Jeffries, while the Republic of Djibouti was represented by Gibson Dunn partner Lord Falconer QC.