"We very much regret it," US Secretary of State Hillary Clinton said after a meeting in Riyadh with foreign ministers from Gulf States, referring to the closure of the Dubai office of the National Democratic Institute (NDI), which was also the subject of a crackdown in Egypt.

Clinton said she discussed the issue with Foreign Minister Sheikh Abdullah bin Zayed Al-Nahayan. "We are as you know, as anyone who has visited the United States, strong believers in a vibrant civil society ... I expect our discussions on this issue to continue," Clinton told reporters.

NDI and the International Republican Institute, US-funded groups loosely affiliated with the two main political parties in the United States, are among a number of foreign and domestic civil society groups that have been prosecuted in Egypt.

In Egypt, the authorities accused campaigners for the non-governmental organisations, including the son of US Transportation Secretary Ray LaHood, of working for groups receiving illegal foreign funding and had prevented them from leaving Egypt.

The United States warned Egypt the case could imperil $1.3 billion in military aid to Egypt, but tensions abated this month when Egyptian authorities lifted a travel ban on some of the foreigners targeted and most of them left the country.

The UAE, one of the world's top five oil exporters, has meanwhile escaped the kind of political upheaval that has reshaped much of the Arab world over the past year.