It was the first time in the 30-year history of the automobile, motorcycle and truck race across the Sahara Desert that it has been called off. In a statement, organizers blamed international tensions, the tourists' Dec. 24 murders and "threats launched directly against the race by terrorist organizations."

"No other decision but the cancellation of the sporting event could be taken," they said.

France, where the race organizers are based, had urged the rally to avoid Mauritania after the family of four was slain in an attack blamed on a terror cell that uses the Mauritanian desert as a hide-out.

French Foreign Minister Bernard Kouchner praised the decision.

"In our opinion, in a complicated geographical context — and above all in a context of insufficient security — it seems very wise to have chosen security, and I commend them for it," he told France-Info radio.

The race organized by the Amaury Sport Organization, which also runs the Tour de France, had been due to start in Lisbon, Portugal, on Saturday and finish in Dakar, Senegal, on Jan. 20. Eight of the stages had been set to take place in Mauritania. Some 550 car, truck and motorcycle drivers were expected for the 5,760-mile trek.

The race's central appeal — its course through African deserts, scrubland and savannas — is also a weak point for security, making it difficult to protect thousands of people as they traverse such remote regions.

Cyril Neveu, a five-time Dakar winner in the motorcycle category, acknowledged that the race could have been targeted by terrorists.

"It is a big caravan of more than 3,000 people," he told French broadcaster I-Tele. He said he respected the organizers' decision but added: "Many are going to be disappointed."

"Providing security from the first to the last competitor is an onerous job," Neveu added. "One cannot say that there was zero risk."

In the past, terrorism fears have forced organizers to cancel individual stages or reroute the race. In 2000, several stages were scrapped after a threat forced organizers to airlift the entire race from Niger to Libya to avoid danger zones. Several stages were also called off in 2004, reportedly because of terror threats in Mali.

French ministers had discussed safety at the rally for the 2008 race at a Cabinet meeting Thursday, and French officials had met with race organizers to discuss the risks.

"The ministry strongly warns all French citizens against going to Mauritania until further orders," government spokesman Laurent Wauquiez said Thursday. "That goes for all French (people), as well as the organization of the Lisbon-Dakar rally."

Only the father of the family survived the Christmas Eve attack in a town 150 miles east of the Mauritanian capital as the family picnicked on a roadside.

That attack was followed by another days later, when three Mauritanian soldiers manning a checkpoint were killed. Mauritania is a largely peaceful Islamic republic that has been rocked by the back-to-back attacks.

Authorities have blamed a terror "sleeper cell" linked to the Algeria-based al-Qaida in Islamic North Africa for the slayings of the family. Al-Qaida in Islamic North Africa claimed responsibility for the killing of the soldiers in an audio tape released to Al-Arabiya TV station.

The Mauritanian government had announced last week that it would mobilize a 3,000-man security force to ensure the race's safety. The country's foreign minister on Friday complained that canceling the race was not justified.

"We have taken every measure to ensure that the rally goes forward without incident," Foreign Minister Babah Sidi Abdallah told RTL television station.