United Nations Secretary-General Ban Ki-moon has said more than 100,000 people have been killed in the escalating conflict in Syria.
Ban called on the Syrian government and opposition to halt the violence, saying it is "imperative to have a peace conference in Geneva as soon as possible."
The secretary-general spoke before talks with U.S. Secretary of State John Kerry, who stood nearby.
"There is no military solution to Syria," Kerry then told reporters. "There is only a political solution, and that will require leadership in order to bring people to the table."
The United States and Russia are trying to convene an international conference in Geneva, along with the United Nations, to try to agree on a transitional government based on a plan adopted in that city a year ago.
Kerry said he talked to Russian Foreign Minister Sergey Lavrov on Wednesday and that both countries remained committed to bringing the warring parties together to further peace efforts.
"We will try our hardest to make that happen as soon as is possible," Kerry said.
In June, the UN increased the estimate of the overall death toll in the civil war to nearly 93,000, with civilians bearing the brunt of the attacks. The Britain-based Syrian Observatory for Human Rights, an anti-government activist organization, placed the tally at more than 100,000 as early as on June 26.
The latest attack claimed the lives of seven people and wounded 62 when a powerful car bomb went off near Damascus on Thursday, Syria's state-run news agency reported.
The Syrian Arab News Agency said the car bomb exploded in the suburb of Jaramana, just few kilometers southeast of Damascus.
Jaramana is an area overwhelmingly supportive of President Bashar Assad's regime.
The Syrian Observatory for Human Rights has confirmed the explosion and the death toll. The blast caused heavy material damage and started a fire, the group said.
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