A top United Arab Emirates court on Tuesday sentenced 64 Islamists to jail terms of up 15 years on charges of plotting to overthrow the government, while acquitting 25 others, Abu Dhabi television reported.

The Federal Supreme Court sentenced 56 of the 94 defendants to between seven and 10 years in prison, and jailed eight others tried in absentia for 15 years, the official television said. Twenty-five others were acquitted.

A Dubai court on Monday upheld four-year jail terms for three Britons, convicted on drugs charges, who were allegedly tortured during their detention, a newspaper based in the emirate reported.

In April, a lower court convicted the trio of possessing for consumption more than one kilogram (2.2 pounds) of synthetic cannabis known as Spice, jailing each one for four years.

U.S. Secretary of State John Kerry extended for a third day on Saturday his shuttle diplomacy between Israeli and Palestinian leaders, raising speculation of progress in reviving long dormant peace talks.

In a commute to which he has grown accustomed, Kerry took a helicopter from Jerusalem to Amman to see Palestinian president Mahmud Abbas and was to return in the evening to follow up with Israeli leaders.

Islamists detained in the United Arab Emirates for allegedly plotting to overthrow the regime have been subjected to systematic mistreatment including torture, three human rights groups said on Thursday.

Ninety-four Islamists who are members or supporters of Al-Islah group linked to the Muslim Brotherhood are on trial in the UAE and expecting a verdict on July 2 from the Court of State Security.

U.S. Secretary of State John Kerry will go to the United Arab Emirates on Saturday, adding a stop to his marathon tour aimed at coordinating support for Syria's rebels, an official said.

Kerry, who arrived in Kuwait on Tuesday evening after a lightning stop in Saudi Arabia, will visit Abu Dhabi to meet Crown Prince Mohammed bin Zayed Al-Nahayan, State Department spokeswoman Jen Psaki said.

A group of 30 Egyptians and Emiratis have been charged by the UAE authorities for allegedly setting up an illegal branch of Egypt's Islamist Muslim Brotherhood, a prosecutor said on Wednesday.

The suspects have been referred to the Gulf nation's State Security Court, prosecutor Ahmed al-Dhanhani said.

An Emirati military jet crashed during a routine training mission in the Gulf country, killing the pilot, the UAE Armed Forces General Headquarters said in a statement.

"Competent authorities were inspecting the scene to investigate causes of the accident," said the statement published by the official WAM news agency late on Sunday.

Leaders of Gulf states, which have tense relations with Iran, have swiftly welcomed moderate cleric Hassan Rowhani's election as the new president of the Islamic republic, several state news agencies said.

"We look forward to working together for the good of this region and the Emirati and Iranian peoples," the UAE President Sheikh Khalifa bin Zayed al-Nahyan wrote in a telegram to Rowhani, state news agency WAM said late Saturday.

A traditional Damascene bath comes to life in the Emirates, as a team of Syrian actors bustle around in wooden clogs on a film set built far away from war-torn Syria.

"Here's the rose water bucket ready with a mix of ginger, cinnamon and lemon," an actress in a traditional off-white dress and red headscarf tells Umm Sakher, wife of the owner of the hammam, or Turkish bath.

Gulf Arab states will consider placing Hizbullah, which is openly involved in the Syrian conflict, on its terror list, al-Rai daily quoted highly placed diplomats on Thursday as saying.

Bahrain will ask foreign ministers of the six-nation Gulf Cooperation Council to discuss "placing Hizbullah on the terror list" at a meeting in Jeddah, Saudi Arabia on Sunday, the newspaper said.