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Two officials familiar with the talks said one challenge has been the length of time it takes to get an answer from the embattled Hamas militant leaders in Gaza after something is agreed upon by political leaders in Doha.Speaking Wednesday in Northern California after his meeting with Chinese President Xi Jinping.

7 attack on Israel by Hamas militants.and they stalled significantly around the time that Israel launched its ground invasion of Gaza.Hostage diplomacy is always complicated.

the hostage issue has become increasingly politically-charged in Israel.but made it clear that did not mean the U.

there has been a focus on roughly 50 civilians.

has been flying unarmed drones over Gaza to help locate hostages an indication of attempts to improve an imperfect intelligence picture from the Palestinian enclave.Millions of people around the world.

Watch that story in the video below: Could gene therapy cure sickle cell anemia? 13:35.which can block blood flow and cause excruciating pain.

of whom 28 reported having no severe pain problems for at least one year after being treated.Helen ONeill of University College London.