"Foreign-backed terrorists kill & wound innocents in Chabahar. As we've made it clear in the past, such crimes won't go unpunished," Zarif tweeted.

"In 2010, our security services intercepted & captures extremists en route from UAE. Mark my words: Iran WILL bring terrorists & their masters to justice" Zarif added in the tweet.

He was captured while on a flight from Dubai to Kyrgystan after Iranian fighter jets intercepted the airliner and forced it to land in Iran and removed Rigi and a number of his companions.