Shares of Al Rajhi Bank were down 1.5% and, National Commercial Bank down 2.1% on news that the lawsuit was filed late on Wednesday in the U.S. District Court in Manhattan, by more than two dozen U.S. insurers affiliated with Travelers Cos, in the latest effort to hold entities in Saudi Arabia liable for the attacks.

The two banks, and companies affiliated with Osama bin Laden’s family and several charities are being sued for at least $4.2 billion.

Riyadh’s stock index was down 0.9%.

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Elsewhere, shares of National Bank of Kuwait rose 1.5% after reporting an 8.1% rise in first quarter net profit to 85.4 million dinars ($280.78 million), slightly above two analysts’ estimates of 83.3 million dinars and 84.0 million dinars.

The bank attributed the rise in net profit to higher net interest income and income from Islamic financing as a result of strong growth in business volumes.

The index on which it trades, however, was down 0.5%.

Dubai’s index extended Thursday’s 0.9% decline and fell 0.3% as 15 shares retreated and only 7 rose. Builder Arabtec, the most traded share, fell 1.6%.

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Shares of investment firm GFH Financial Group, however, were up 0.9% after the company said one its units had signed a deal to acquire a U.S. based data center, in partnership with a New York Stock Exchange listed real estate investment trust, with a market value exceeding $100 million.

The subsidiary plans to offer the investment for private placement.

In Abu Dhabi, shares of the now largest bank by assets in the United Arab Emirates, First Abu Dhabi Bank, rose 1.4%. Shares of the lender had declined on five of the last six trading sessions on profit taking.

The index was up 0.4%.