By John Solomon
How the government's punishing of the exposure of official wrongdoing can linger for years

Families of Iran's slain nuclear scientists have filed a lawsuit against Israel, the U.S. and Britain accusing them of involvement in the assassination of their loved ones.

The first indication that Israel has resorted to military action against Iran's nuclear program would be explosions across the Islamic republic.

U.N. nuclear inspectors began a critical mission to Iran on Sunday to probe allegations of a secret atomic weapons program amid escalating Western economic pressure and warnings about safeguarding Gulf oil shipments from possible Iranian blockades.

Iran said Saturday it has evidence that the United States was behind the assassination of an Iranian nuclear scientist this week in Tehran, state media reported.

Thousands of mourners chanted "Death to Israel" and "Death to America" on Friday during the funeral of a slain nuclear expert whom Iranian officials accuse the two nations of killing in a bomb blast this week as part of a secret operation to stop Iran's nuclear program.

Two assailants on a motorcycle attached a magnetic bomb to the car of an Iranian university professor working at a key nuclear facility, killing him and another person Wednesday, state TV reported. The slayings suggest a widening covert effort to set back Iran's atomic program.

Secretary of State Hillary Rodham Clinton "categorically" denied Wednesday any U.S. involvement in the car bombing of an Iranian nuclear scientist in Tehran, the fourth in a series of attacks over the past two years apparently aimed at disrupting Iran's disputed nuclear program.

Secretary of State Hillary Rodham Clinton said Wednesday that the United States played no role in the killing of an Iranian nuclear scientist and said the U.S. is looking for an international understanding with Iran that ends its uranium enrichment program.

An Iranian nuclear scientist was killed in a bomb blast in Tehran on Wednesday, just days after the U.N.'s nuclear watchdog agency confirmed that Iran had begun enriching uranium in an underground facility.