Iran has arrested four people suspected of attempting to sabotage one of its nuclear plants, Atomic Energy Organisation chief Ali Akbar Salehi said on Sunday. \"Some time ago, we uncovered sabotage activities by several people at a nuclear plant,\" Saleh said in comments carried by the Mehr news agency. \"We let them continue their activities so that we could gather more intelligence. \"We arrested them at the appropriate moment and their interrogation is ongoing.\"