In slaying probe, Iran claims it penetrated Mossad

This undated file photo released by the semi-official Iranian Fars News Agency shows nuclear physics professor Masoud Ali Mohammadi, who was killed after a bomb blast in front of his house, in northern Tehran's Qeytariyeh neighborhood, Iran, on Tuesday, Jan. 12, 2010.

January 10, 2011 5:39:36 AM PST
Iran says it has arrested suspects in the assassination a year ago of one of its nuclear scientists in a months-long covert operation that also led it to penetrate Israel's Mossad spy agency.