Jameh's cousin, Haitham Jameh, told Lebanon-based Al-Mayadeen TV that the general was killed when a bomb exploded as he led his troops in an operation in Deir el-Zour, site of more than a year of clashes between regime forces and rebel fighters, who control most of the province.
He was the most powerful Syrian officer to be killed since a July 2012 bomb attack on a Cabinet meeting in Damascus killed four top officials, including the defense minister and his deputy, who was President Bashar Assad's brother-in-law. That attack also wounded the interior minister.
Jameh played a major role in Lebanon when Damascus dominated its smaller neighbor. When Syrian troops withdrew from Lebanon in 2005, ending nearly a three-decade military presence, Jameh was in charge of Syrian intelligence in the capital, Beirut.
He was among several top Syrian officers suspected of having a role in the 2005 assassination of former Lebanese Prime Minister Rafik Hariri. Syria denies any involvement in the slaying.
Four members of the Syrian-backed Hezbollah were charged in 2011 by a U.N.-backed tribunal with plotting the attack that killed Hariri, though none have been arrested. Their trial is scheduled to start in January. A fifth Hezbollah member was indicted earlier this month.
Mustafa Alloush, a senior member in Hariri's Future Movement, noted that Jameh was in charge of Beirut's security at the time of the assassination, and "it is difficult to believe that Hezbollah carried out such an operation without full coordination with Syrian intelligence."
In Moscow, meanwhile, the Syrian deputy prime minister, Qadri Jamil, floated Nov. 23-24 as possible dates for talks on a political solution to the Syrian conflict, though there was no agreement on the ground rules for negotiations and the main Western-backed opposition hasn't decided whether to attend.
The United States and Russia have been trying to bring the Damascus government and Syria's divided opposition to negotiations in Geneva for months, but the meeting has been repeatedly delayed. It remains unclear if either side is really willing to negotiate while Syria's civil war, now in its third year, remains deadlocked.
U.N. Secretary-General Ban Ki-moon said Wednesday that efforts were intensifying to try to hold the Geneva meeting in mid-November. Ban did not provide specific dates, and it's not clear whether those provided by Jamil had been agreed to by any other parties.
The talks have been put off repeatedly, in part because of fundamental disagreements over the fate of Assad.
The Western-backed Syrian National Coalition, the main alliance of political opposition groups, has said it will only negotiate if it is agreed from the start that Assad will leave power at the end of a transition period. Many rebel fighters inside Syria flatly reject negotiating with Assad's regime.
The regime has rejected such a demand, saying Assad will stay at least until the end of his term in mid-2014, and he will decide then whether to seek re-election. The regime has said it refuses to negotiate with the armed opposition.
Also Thursday, the international agency overseeing the destruction of Syria's chemical weapons stockpile said that inspectors have so far found no "weaponized" chemical munitions, or shells ready to deliver poison gas or nerve agents, and that Syria's declarations up to now have matched what inspectors found.
The Organization for the Prohibition of Chemical Weapons and the United Nations are working to verify Syria's initial declaration of its weapons program and render production and chemical mixing facilities inoperable by Nov. 1. Their work on the ground involves smashing control panels on machines and destroying empty munitions.
The team has visited 11 of more than 20 sites since Oct. 1 and carried out destruction work at six. "Cheap, quick and low-tech. Nothing fancy," OPCW spokesman Michael Luhan said of the work.
The next phase gets more complex and dangerous, however, when actual chemical weapons have to be destroyed in the midst of full-blown war. Negotiations are still underway as to how and where that will happen.
Syria's revolt began in March 2011 with largely peaceful protests against the Assad regime before turning into a civil war. The conflict has killed more than 100,000 people, forced more than 2 million to flee the country and left some 4.5 million others displaced within the country.
It has also proven difficult and dangerous for journalists to cover, and press freedom advocate groups rank Syria as the most dangerous country in the world for reporters. Dozens of journalists have been kidnapped and more than 25 have been killed while reporting in Syria since the conflict began.
On Thursday, Sky News Arabia said that a team of its reporters had gone missing in the contested city of Aleppo. The Abu Dhabi-based channel said it lost contact on Tuesday with its reporter, cameraman and their Syrian driver.
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Associated Press writers Laura Mills in Moscow and Edith Lederer in New York contributed to this report.
