A French photojournalist and an American working for a British newspaper were killed Wednesday by Syrian government shelling of the opposition stronghold of Homs, France's government said.
Activists said at least two other Western journalists were injured in barrages that claimed at least 19 lives.
In Paris, French government spokeswoman Valerie Pecresse said those killed were French photojournalist Remi Ochlik and American veteran war reporter Marie Colvin, who was working for Britain's Sunday Times. France's Foreign Minister, Alain Juppe, said the attacks show the "increasingly intolerable repression" by Syrian forces.
The Syrian military has redoubled its attacks on Homs in the past few days, aiming to retake neighbourhoods that have come under control of the opposition and armed rebels — many of them military defectors. The seizure of territory and nearly daily clashes between the rebels and regime forces have pushed Syria to the brink of all-out civil war.
A Homs-based activist, Omar Shaker, also said two other Western journalists were wounded. including a photographer for the Sunday Times and a Spanish reporter.
Separately, the French daily Le Figaro said one of its reporters, Edith Bouvier, had been among the journalists wounded in the incident.
There was no immediate comment from the Sunday Times or Ochlik's photo agency.
He said the journalists were killed when several rockets hit a garden of a house used by activists and journalists in the besieged Homs neighborhood of Baba Amr, which has come under weeks of heavy bombardment by forces from Assad's regime. At least 19 people were killed in Wednesday's shelling, including the journalists, activists said.
Shaker said the bodies were taken to a makeshift hospital in Baba Amr.
The UN estimates that 5,400 people have been killed in repression by the regime of President Bashar al-Assad against a popular uprising that began 11 months ago. Syrian activists, however, put the death toll at more than 7,300.
He added that intense Syrian troops shelling with tanks and artilleries began at 6:30 am and was continuing hours later. He said the apartment used by journalists was hit around 10 am
An amateur video posted online by activist showed what they claimed were bodies of two people in the middle of a heavily damaged house. It said they were of the journalists. One of the dead was wearing what appeared to be a flak jacket.
The journalists' deaths came a day after a Syrian sniper shot dead Rami al-Sayyed, a prominent activist in Baba Amr who was famous for posting online videos, Shaker and the Local Coordination Committees activist group said.
On Jan. 11, award-winning French TV reporter Gilles Jacquier was killed in Homs. The 43-year-old correspondent for France-2 Television was the first Western journalist to die since the uprising began in March. Syrian authorities have said he was killed in a grenade attack carried out by opposition forces — a claim questioned by the French government, human rights groups and the Syrian opposition.
"Homs is a very, very dangerous place," Bassma Kodmani, spokeswoman for the Syrian National Council, the most representative Syrian opposition umbrella group, told reporters in Paris.
"I see no reason why opposition members would shoot at journalists," she said. "It is, therefore, most probably related to the regime."
Last week, New York Times correspondent Anthony Shadid died of an apparent asthma attack in Syria after he snuck in to cover the conflict.
Remi Ochlik, a 28-year old photographer recently won the first prize in the general news category of the World Press Photo contest for his works captured in Libya in 2011.