JERUSALEM, Dec 29 (Reuters) - At least 51 civilians in the Gaza Strip have been killed in Israeli air strikes since Saturday, according to a tally by a U.N. aid agency. "It is likely to be conservative and it is certainly rising," UNRWA spokesman Christopher Gunness said on Monday. He said the estimate was based on visits by UNRWA officials to hospitals and medical centres across the Gaza Strip. Palestinian officials have said more than 300 people, including scores of civilians, have been killed in the Hamas-controlled territory since the Israeli offensive began. (Reporting by Adam Entous, Writing by Dan Williams, Editing by Jeffrey Heller)
The sun sets behind an Israeli tank near Kibbutz Mefalsim, just outside the northern Gaza Strip December 28, 2008. Israel destroyed Hamas's main Gaza security complex in an air strike on ...