The killing of Saleh al-Arouri, the deputy head of the political bureau of the Palestinian militant orhanization Hamas, has made negotiating with Hamas more difficult, Qatari officials have said. Qatar has been mediating in the Israel-Hamas war in Gaza, alongside Egypt and the United States. The US news outlet Axios, citing a Qatari official and an Israeli source, reported that the Qatari prime minister and other officials told family members of six US and Israeli hostages that the death of al-Arouri in Beirut had made efforts to secure a new deal more difficult. Qatari Prime Minister Abdulrah…