Israel had been reportedly surveilling Iran for years before deciding to attack the country’s nuclear operations earlier this month. Its spy agency, Mossad, concluded that Tehran’s nuclear and missile programs had advanced more than previously known.

“Israel likely has around 30 to 40 cells operating inside Iran,” defence analyst Hamze Attar told Al Jazeera from Luxembourg, “with most of those made up of collaborators, rather than Israeli agents, which also makes Iran look weak,” he said, citing the assembly instructions found on the hardware seized by authorities.

The country’s defense minister, Israel Katz, said Israel would try to prevent Iran from rebuilding its missile and nuclear programs, despite a truce.