DAMASCUS, Syria (AP) -- Syria's foreign minister has accused the Unites States of trying to create a "negative climate" for dialogue at the second round of peace talks in Geneva.

The meetings between Syrian President Bashar Assad's government and the opposition seeking his ouster ended on Saturday without finding a way of breaking the impasse in the nearly three-year-old conflict.

The crisis started as largely peaceful protests against Assad in March 2011 but later degenerated into a civil war in which more than 130,000 people have been killed.

Walid al-Moallem said Sunday that the U.S. tried to "create a very negative climate for dialogue in Geneva." His comments were carried by the state news service as the Syrian delegation was returning from Switzerland to Damascus.

Washington is backing the opposition in Syria's conflict.