Hamas expressed shock on Wednesday over Saudi Arabiainfo-icon's demand that Qatarinfo-icon end its support for the Palestinian Islamist movement as tensions flared between Gulf Arab states.

Saudi Arabia and its allies cut off ties with Qatar on Monday after accusing the gas-rich state of supporting extremism across the region.

On Tuesday, Saudi Foreign Minister Adel Al-Jubeir said that to rebuild relations, Dohainfo-icon must cut its support for "extremist" groups, including Hamas.He said Qatar-supported Hamas, which runs the Gazainfo-icon Strip, "undermines the Palestinian Authority."

In a statement on its website, Hamas said the party felt "deep regret and disapproval" at the Saudi statement.

"These statements are a shock to our Palestinian people and to our Arab and Islamic nation, which considers the Palestinian cause its central cause," the statement said.

Hamas swept Palestinian parliamentary electionsinfo-icon in 2006 but remains blacklisted as a terrorist group by the European Unioninfo-icon and the United Statesinfo-icon.

The Islamist movement seized Gaza in a near civil warinfo-icon with forces loyal to Palestinian president Mahmud Abbas in 2007. The two factions have been at loggerheads ever since.Hamas has fought three wars with Israelinfo-icon since 2008, and the Jewish state enforces a crippling blockade on Gaza.

Qatar has provided tens of millions of dollars for the reconstructioninfo-icon of Gaza since the last conflictinfo-icon with Israel in 2014.