TEHRAN (Reuters) - At least three reporters working for Iran's official IRNA news agency, reported kidnapped by state television, have been arrested by Baghdad police, one of the agency's senior editors said on Wednesday. Iranian journalists have run into trouble with the authorities in Iraq before. Iraq's defense minister has recently upped anti-Iranian rhetoric, accusing Tehran of sending spies and arms across the border to foment unrest. "Local police have arrested three of our colleagues in Iraq," Hassan Lavasani, the head of foreign news at IRNA, told Reuters. He said the bureau chief and two other Iranian reporters had been...