LONDON — Officials working for Qatar intimidated witnesses and claimants in a terror-funding case filed by eight Syrian refugees against Doha Bank, the high court in London heard on Wednesday.

Ben Emmerson QC, representing four of the Syrian claimants, told the high court that interference with justice has taken the form of “harassment, intimidation, pressure, unlawful covert surveillance overseas, threatened visits by armed and masked men during the night, attempted bribery and criminal inducements”.

The claimants say they fled to the Netherlands after their lives and homes were destroyed by a militant organization that controlled parts of northern Syria. They are suing the bank because it was allegedly used to channel funds to the terror group, which is a proscribed organization in the United Kingdom, the Guardian reported.

None of the eight claimants have been identified. Doha Bank has offices in London, which has enabled the case to be brought in the British courts.

Emmerson said SO15, the Metropolitan police’s counterterrorism command, had been given details of the campaign of intimidation involving attempts to pervert the course of justice in both the UK and the Netherlands. The incidents, the court heard, included attempts to bribe witnesses, surveillance, and harassment. They had been carried out on the orders of the state of Qatar, he alleged.

The latest threats, it was said, involved night-time visits by masked men to the homes of individuals this week. The Qataris, it is alleged, are trying to identify those involved in the case despite the fact they are protected by anonymity orders.

Four of the claimants had in effect withdrawn from the action because of threats to their physical safety, the court was told.

Giving her ruling, the judge, Rosalind Coe QC, said the case was highly unusual and involved very grave allegations. She agreed “reluctantly” to adjourn the case so that it could be “managed more robustly” and stronger evidence gathered.