BEIRUT, Lebanon – A car bomb blasted the motorcade of Lebanon’s outgoing pro-Syrian defense minister yesterday, wounding him and killing one person in an attack that deepened fears of increasing violence.

The assassination attempt against Elias Murr was the latest in a string of bombings that have killed or wounded politicians and other prominent figures in Lebanon. But while the others targeted opponents of Syria – prompting accusations that Damascus was behind the killings – yesterday’s explosion was the first to hit one of Syria’s strongest allies.

That heightened concerns that more hands are at play in violence amid Lebanon’s political instability. With Syria’s domination crumbling after the withdrawal of its troops in the spring, its opponents in Lebanon are moving to take power while its allies struggle to retain influence.

The anti-Syrian camp has been trying to form a government after winning a majority in parliament, but haggling over the posts has held up the process.

Mr. Murr, appearing later on TV from his hospital bed, urged Lebanese to close ranks and confront what he called “a conspiracy” to destabilize the country. Although appearing tired and breathing heavily, Mr. Murr seemed fine.

President Lahoud of Lebanon, who is staunchly pro-Syrian, has reportedly been pressing for Mr. Murr – his son-in-law, who is deputy prime minister and defense minister in the outgoing government – to be given a post in the Cabinet.

“Their only goal is to strike at the symbols of moderation and patriotism with the aim of undermining stability,” Mr. Lahoud said in a statement issued after visiting Mr. Murr. The bombing, Mr. Lahoud added, was part of “a terrible scheme” against Lebanon.

Mr. Murr, 43, was driving his own car in his motorcade through the northern Naqash district – a neighborhood of embassies and diplomatic residences – when a vehicle packed with up to 132 pounds of explosives detonated next to it.

The blast, heard across Beirut, knocked a crater in the pavement, shredded one vehicle in the motorcade and damaged several others. The attack vehicle was hurled over a stone wall into a nearby villa.

Mr. Murr staggered out of his damaged vehicle, bloodied and leaning on passersby who rushed to help, witnesses said. Twelve other people were wounded – including the Mexican ambassador’s wife in a nearby residence – and one charred body was removed from one of the cars. “When the explosion occurred, I saw nothing. I saw only fire in the car,” Mr. Murr told the Lebanese Broadcasting Corporation from his hospital bed. “The officer sitting next to me was unconscious. I looked at my bodyguard who was also unconscious.”

Mr. Murr said he tried pulling the men from the car but the doors were locked. He managed to climb out of a broken window before ambulances arrived to ferry him and the others to hospital.

He also criticized anti-Syrian groups that have accused Damascus of killing a former prime minister, Rafik Hariri, and two anti-Syrian figures.

“When a group accuses another group, this encourages the bombers to continue their bombings,” he said.

The son of the assassinated former prime minister, Saad Hariri, is the leader of the anti-Syrian coalition that won a majority in parliament in last month’s elections. Saad warned of a “secret hand” sowing instability in Lebanon.

“This is part of the series [of assassinations] directed against all of Lebanon,” Mr. Hariri said outside the hospital where Mr. Murr was being treated. “We must fight them.”

The assassination of Rafik Hariri on February 14 triggered anti-Syrian protests at home and international pressure that eventually ended three decades of Syrian domination of Lebanon.

An anti-Syrian Druze leader, Walid Jumblatt, said Mr. Murr has fallen out of favor with the Syrians. He suggested the attempt to kill Mr. Murr was part of a plan to eliminate anyone who may have inside knowledge about Hariri’s assassination.