Iranians chant anti-Israel and anti-US slogans and wave Palestinian flags as they rally in Tehran to denounce Israel's resumption of massive military operations in the Gaza Strip, expressing pessimism about any tangible results from negotiations with the United States on the nuclear issue. Iran has had no diplomatic relations with Washington since 1980, but is set to hold nuclear talks with US officials in Oman on April 12. IMAGES AND SOUNDBITES