US already in covert war with Iran?

RT

The US and Iran seem to be engaged in a political game that could be dangerous. The US, UK and Canada announced stricter sanctions on Iran that targets its oil and gas industry. Since then, key scientists involved in Iran's nuclear program have been assassinated and several Iranian government buildings have been blown up. 

These series of mysterious incidents have led many to believe the US is attempting to stop Iran from allegedly building up their nuclear program. Jamal Abdi, policy director at the National Iranian American Council, helps analyze the new sanctions and the recent events in Iran.