Syria's Foreign Minister accused the United States of trying to create a "negative climate" for dialogue at the second round of peace talks in Geneva, while Secretary of State John Kerry blamed "the Assad regime's obstruction" for making the tense talks even more difficult, the Associated Press reports.

The comments by Walid al-Moallem on Sunday came a day after the meetings between Syrian President Bashar Assad's government and the opposition seeking his ouster ended without finding a way of breaking the impasse in the nearly three-year-old conflict.

Al-Moallem spoke to the state news service about the talks as the Syrian delegation was returning from Switzerland to Damascus. He said the U.S. tried to "create a very negative climate for dialogue in Geneva."

Kerry's statement late Sunday repeated the U.S. commitment to finding a political solution to the conflict, and he praised the opposition's "mature seriousness of purpose and willingness to discuss all aspects of the conflict."

In contrast, Kerry said, "while it stalled in Geneva, the regime intensified its barbaric assault on its civilian population with barrel bombs and starvation. It has even gone as far as to add some of the opposition delegates at Geneva to a terrorist list and seize their assets. This is reprehensible."

More than 5,792 people have reportedly have been killed in Syria since the Geneva talks began on Jan 22, activists said.