US
Earlier, Taliban sources said group's leadership had arrived in Islamabad for talks
Afghan govt confirms the death of the elusive leader
Afghan government statement also confirms Omar's death, says grounds for peace talks are now more paved than before
Official says some headway is expected in the July 31 negotiations
Afghan peace body spokesperson says exact venue of talks still undecided
Doha-based Taliban leaders said to have broad-based backing on the peace talks
Afghanistan claims four people were killed in cross-border firing
Afghan foreign ministry alleges three civilians were killed in Pakistan's cross-border shelling
Analysis posted on group's website suggests four points to making the peace process successful
Tehreek-e-Taliban Pakistan claimed responsibility for the attack