Tensions between U.S., Iran rise with killing of another Iranian nuclear scientist

http://www.theglobeandmail.com/news/world/tensions-between-us-iran-rise-with-killing-of-another-iranian-nuclear-scientist/article2298615/
  An Iranian nuclear scientist was killed in January 11. Before he was killed, there were many Iranian scientists are killed by terrorists. And Iran's Vice-President Mohammad Reza Rahimi said that there was “evidence of (foreign) government-sponsored terrorism.” . Obama said America will stop Iranian to make nuclear weapon. The nuclear weapon of Iran make other countries worry although Iran said it just is used to peaceful, power-generating purposes.
  I think the died of the scientists is related to the other countries. They should prove it is used to peaceful. If they don't don't do that, the number of the scientists won't stopped increase.