From [1] UPI, with thanks to Kemaste:

Iran has begun preparing for a possible U.S. attack, or at least trying to dissuade Washington from such an attack by appearing to prepare for war.

Tehran has recently disclosed efforts to bolster and mobilize recruits in citizens' militias and making plans to engage in the type of asymmetrical warfare used against U.S. troops in Iraq, the Washington Times reported Saturday.

"Iran would respond within 15 minutes to any attack by the United States or any other country," said an Iranian official who spoke on the condition of anonymity.