WASHINGTON/RAMALLAH (Reuters) - The United States on Friday halted all funding to a U.N. agency that helps Palestinian refugees in a move likely to further heighten tensions between the Palestinians and the Trump administration. FILE PHOTO: A Palestinian woman takes part in a protest against possible reductions of the services and aid offered by United Nations Relief and Works Agency (UNRWA), in front of UNRWA headquarters in Gaza City August 16, 2015.