TEHRAN, Iran — Iran reiterated that three Americans jailed a year ago should stand trial on charges of illegally crossing the country's borders.

Foreign Ministry spokesman Ramin Mehmanparast said Iran is also considering other possible charges against Shane Bauer, Sarah Shourd and Josh Fattal including intentionally acting against Iranian security, according to a state media report. There has been no indication from Iran so far that formal charges have been filed.

The Americans' families and the U.S. government say the three are innocent and accidentally crossed Iran's border while hiking in northern Iraq.

"The three American citizens have been detained for illegal entry to Iranian territory," Mehmanparast said, according to the website of the state broadcasting company. "So the violation of law is obvious and they should be answerable before the law like any other individual."

Iranian President Mahmoud Ahmadinejad has in the past proposed swapping the three for Iranians he says are jailed in the U.S., raising fears that the Americans are being held as bargaining chips.