Syrian troops opened fire on protesters on Friday in Damascus and the northern city of Aleppo, the country's commercial hub, as at least 90 deaths were reported across the country.

Regime forces shot dead 14 people in Homs, 24 in Idlib, three in Daraa, four in Damascus, 12 in Aleppo, seven in the Yarmouk Palestinian refugee camp in Damascus, two in Hama, two in the countryside around Damascus, one in Deir Ezzor and one in Latakia, the Local Coordination Committees, the main activist group spurring protests on the ground, said.

Bedouin men kidnapped two U.S. tourists and their guide in Egypt's lawless Sinai on Friday, police said, adding that they were demanding the release of a jailed tribesman in exchange for the hostages.

The Bedouin captured the American man and woman in the middle of the peninsula, where they were in a car with their Egyptian guide, almost a month after tribesmen briefly kidnapped a tourist from Singapore.

An Israeli teenager who killed a Palestinian from east Jerusalem in a racially-motivated attack last year has been sentenced to eight years in jail.

In February 2011, 24-year-old Hossam al-Ruweidi was killed during an attack in central Jerusalem by four Jewish youths.

Two people were killed and 16 others wounded in five separate attacks in Iraq on Friday, security and medical officials said.

In Baghdad, a police major's mother was killed and his father was wounded when a bomb detonated inside their house in the western neighborhood of Ghazaliyah.

The U.N. envoy to Yemen, Jamal Benomar, said on Friday that southern separatists and northern Shiite rebels have been invited to participate in a national dialogue set for November.

"Contacts have been made with all the parties, including the Southern Movement and the Houthis (Zaidis), to join the national dialogue and there is now agreement to begin the preparatory phase," Benomar said at the end of a two-week visit.

Around 1,500 Jordanians, mostly Islamists, marched on Friday to reject a controversial electoral law, a day after the Muslim Brotherhood decided to boycott early polls expected later this year.

"We demand a democratic electoral law. We want to change the constitution and fight corruption," read a banner carried by the protesters in central Amman.

A Palestinian was killed on Friday when Israeli troops opened fire at him in an area near the border in the northern Gaza Strip, medical sources said.

Ashraf al-Qudra, a spokesman for Gaza's emergency services, confirmed a man in his early 20s was shot dead by troops near the border, but said they had not yet been able to retrieve his body.

A Russian ship that tried to deliver attack helicopters to Syria last month has again left its Arctic port carrying the same military cargo, the state's military export agency said on Friday.

"The Mi-25 helicopters subject for return to Syria after their repair are currently aboard the Alaed, which is sailing from the port in Murmansk to another port in Russia," Interfax quoted a Rosoboronexport statement as saying.

U.N. observers in Syria are ready to go to the central village of Treimsa, where 150 people were reported massacred, if a ceasefire is in place, mission chief Major General Robert Mood said on Friday.

"UNSMIS stands ready to go in and seek verification of the facts, if and when there is a credible ceasefire," Mood, the head of the U.N. Supervision Mission in Syria, told a news conference in Damascus.

Israeli border police killed a man and wounded another when the two tried to cross the Egyptian border into Israel, the army said on Friday, with a security source saying the two were unarmed Gazans.

"Overnight, Israeli border police identified two suspects infiltrating Israel through the Israel-Egypt border," an army spokesman said.