Tensions on the rise in Iran

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>> washington.

>>> now to a story we are watching closely overseas right now. our tehran bureau chief tells us things are growing tense in iran tonight. there are other signs from there something may be coming. the government and the political opposition are squaring off for what could be a big confrontation on thursday, which is the anniversary of the revolution there. there is, according to ali aruzzi a visible and massive security presence in the capital. authorities have issued serious threats to anybody who plans to protest. there's been a new wave of arrests across iran in recent weeks. we'll stay on this story closely, again over the next 24 to 48 hours .

>>> owe our broadcast continues here

Tensions on the rise in Iran

The Iranian government is squaring off with the opposition for what could build into a major confrontation by Thursday, the anniversary of the revolution. NBC's Brian Williams reports.

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