By Emma Farge GENEVA, July 6 (Reuters) - A U.N. human rights body on Monday called Israel’s detention of Gazan doctor Hussam Abu Safiya arbitrary and urged his immediate release, as rights groups and his lawyer warned that his life was in imminent danger. In its finding, the U.N. Working Group on Arbitrary Detention said that Israel's actions contravened multiple articles of the Universal Declaration of Human Rights as well as the International Covenant on Civil and Political Rights.