The US military steps up efforts to stop Iran from using the marshes of southern Iraq to smuggle weapons.
Iran's government of Mahmoud Ahmadinejad planned a rally on the anniversary of the US Embassy takeover. But pro-democracy demonstrators staged counter-protests. Iranian police clashed violently with them.
Iran said the guards were just chasing drug dealers when they crossed into Pakistani soil Monday. But some in Pakistan suspect it has to do with last week's deadly suicide bombing in Iran.
A round of talks on Iran's nuclear program in Vienna, at which the US and other powers were hoping to nail down a deal, faltered on Tuesday.
Iran says all three countries have links to a Sunni group blamed for Sunday's suicide blast that killed at least five senior members of Iran's Revolutionary Guard.
A Sunni insurgent group, Jundallah, claimed responsibility for Sunday's attacks that killed six of Iran's elite Revolutionary Guards and more than 20 others.
At a midday break, diplomats said the tone has been "civil" but a US official says Iran's delegation lacks the 'cohesion and confidence' to make a deal.
The show of force ahead of nuclear talks is a well-tested strategy. But only 1 in 10 Iranians support nuclear weapons, and many question the government's legitimacy after June elections.
Iran tested two mid-range missiles that can reach Israel and southeastern Europe Monday. The test will help the country perfect its ballistic technology.