The Israeli and Palestinian leaders Sunday blamed each other for the impasse in newly launched peace efforts, raising doubts about whether the dialogue would continue just weeks after it began. Palestinian President Mahmoud Abbas accused Israel of spoiling the low-level talks, saying it failed to present detailed proposals for borders and security requested by international mediators. Israeli Prime Minister Benjamin Netanyahu said the Palestinians “refused to even discuss” Israeli security needs. For the past month, the sides have held Jordanian-mediated exploratory talks at the urging of the Quartet of international Mideast mediators. The goal of the talks has been to find a formula to resume formal peace negotiations, with the aim of forging an agreement this year. The Palestinians say a three-month period set by the Quartet for the exploratory talks ended last week, counting from the day the mediators issued their marching orders last October.