BOGOTA, Colombia (AP) — Absent from the peace talks opening in Norway this week between Colombia's main leftist rebel movement and the government will be the guerrilla heavyweights who presided a decade ago over the last attempt to end a conflict that has claimed tens of thousands of lives over nearly half a century.

This time, the faces and names of the negotiators for the Revolutionary Armed Forces of Colombia, or FARC, are little known to their countrymen. Many of the former top leaders are dead, most killed in military raids, while a few others are believed to have remained in the field.

Also unlike the last talks in 1999-2002, the rebels this time have no safe haven and there's no cease-fire; President Juan Manuel Santos refused to accept one.

With a much weaker negotiating position this time around, Colombia's battered rebels are keeping a low profile heading into the talks being held at an undisclosed location outside Oslo. There is no media access and even the hour and date of the gathering, originally said to be scheduled for Monday, are uncertain.

The rebels, meanwhile, have offered only a vague sense of what they will demand in exchange for laying down their arms, beyond land reform and guarantees of safety for fighters who demobilize.

The upcoming talks were the subject of a demonstration in Bogota on Sunday, with protesters demanding justice for civilians allegedly disappeared by the rebels and requesting a voice in the peace negotiations.

Former President Andres Pastrana, who presided over Colombia's last round of peace talks that ran nearly the entire length of his 1998-2002 term before collapsing in discord, is among the Colombians who wonder why two still-powerful commanders who took part in the previous negotiations, Joaquin Gomez and Fabian Ramirez, will be absent from the Norway talks.

"The question we have to ask is: Is the FARC monolithically united behind this process?" said Pastrana, who met secretly with legendary FARC founder Manuel Marulanda in 1998 to arrange the last round of talks. "I don't have that very clear. Let's hope it is."

The FARC negotiators, whose discussions with the government are to move to Havana later this month, do include one member of the rebels' ruling six-man Secretariat, Ivan Marquez, as well as Marco Leon Calarca, the rebels' public voice during the 1990s.

Another negotiator, Ricardo Tellez, was seized in 2004 by Colombian agents in Venezuela but freed by the Colombian government three years later as a good-faith gesture to encourage the FARC to free all its "political hostages."

The rebels released their last such captives in April, meeting a condition of the agreement under which secret preliminary talks began on Feb. 23 in Havana.

Possibly participating by teleconference in the Oslo discussions will be the fifth FARC negotiator, Ricardo Palmera. Serving a 60-year sentence in the United States, the former banker gained fame during the last talks and is the only negotiator well-known to Colombians.

Palmera was convicted in the abduction In 2003 of three U.S. military contractors whose surveillance plane crashed in rebel territory due to mechanical failure. The three men were rescued in July 2008 along with former presidential candidate Ingrid Betancourt in a sophisticated ruse involving Colombian commandos posing as international relief workers.

Colombia's chief prosecutor has said that Palmera could be allowed to participate in the Oslo talks via teleconference from a prison in Colorado.

Many of the FARC's former top leaders have been captured like Palmera or killed in military raids that began tipping the conflict in the government's favor in 2008.

The group's founding leader, Manuel Marulanda, died of an apparent heart attack in 2008, the same year its chief spokesman at those talks, Raul Reyes, was killed in a cross-border military raid into Ecuador that briefly brought regional tensions to a boiling point. In September 2010, the group lost its undisputed field marshal, Jorge Briceno, or Mono Jojoy, in an air assault on his jungle hideout. And Marulanda's successor atop the FARC, Alfonso Cano, was killed by Colombia's military last year.

The rebels' footprint is also much diminished, though the insurgents have stepped up hit-and-run attacks in recent months, particularly on oil installations, and still control large swathes of territory.

While the FARC operated in more than half of Colombia's 1,102 municipalities at the height of its strength in the 1990s, its activity is now focused on just 70 municipalities, the Defense Ministry says. The FARC's current top commander, Timoleon Jimenez, commands an estimated 9,000 rebels, a force depleted by desertions from roughly twice that number a decade ago.

Jimenez acknowledged on Sept. 4, when both sides announced the formal peace talks, the damage inflicted on his organization by the U.S.-backed military buildup that began in 2000 under Pastrana and was intensified by his successor, Alvaro Uribe, for whom the country's current president, Santos, served as defense minister from 2006-2009.

"Let us seek dialogue, a bloodless solution, an understanding through political means," Jimenez, 53, said in an interview published last month by the Communist Party weekly Voz.

The weekly's editor, Carlos Lozano, says it is crucial to the FARC that if its fighters lay down their arms and enter politics they are not hunted down and killed as some 5,000 partisans were in the 1980s from the rebels' then-political arm, the Union Patriotica.

While Colombians are weary of the decades-long conflict, the FARC's leftist politics remains anathema to Colombia's ruling elite. The peasant-based insurgency grew out of a 1950s agrarian self-defense movement that later fused with communist activists who the U.S. government helped suppress.

The agreement signed Aug. 26 in Havana setting the peace talk agenda says the goal will be to achieve "economic development with social justice" for the great majority of Colombians. It prioritizes access to fertile land for the rural poor, full political participation and the end of rebel participation in the illegal narcotics trade.

While the last priority is the government's, the others are FARC goals, Lozano said. The government accuses the FARC of financing itself with the cocaine trade.

Colombia is a land of deep inequities. Much of its countryside is controlled by cattle ranchers who in the 1980s formed far-right militias to defend themselves against rebel kidnapping and extortion.

More than 1.2 million people, mostly poor farmers and laborers, have been forcibly displaced in the past five years, mostly by the far-right militias, and 5.2 million people since 1985, according to the CODHES independent rights group.

Sixty percent of Colombia's fertile land is in the hands of just 14,000 landowners while 2.5 million peasants together own no more than 20 percent, according the Alejandro Reyes, director of Colombia's INCODER land reform agency.

Former President Belisario Betancur, who attempted to make peace with the rebels during his 1982-86 term, says he's optimistic this time around. But the 89-year-old Betancur says he's not sure how FARC demands for a more equitable society and for attacking rural poverty can be met quickly.

"Governments can't satisfy FARC demands by decree," he said. "Imagine. That would be childish, a utopia."

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Associated Press writers Cesar Garcia in Bogota and Frank Bajak in Lima, Peru, contributed to this report.