By Arafat Barbakh, Emily Rose and Jeff Mason GAZA/JERUSALEM/WASHINGTON (Reuters) -The White House said on Tuesday its envoy was having active discussions about ensuring the release of hostages in Gaza and securing a humanitarian pause in the war after Israel suffered its worse loss of soldiers in over three months of conflict. In the hours after the death toll of 24 from two separate incidents became clear, officials in Israel reiterated that the objectives of its war against the Palestinian Hamas movement that runs Gaza were unchanged and that efforts were being made to bring about release of…