Pakistan, Aug. 9 -- Iran has arrested 20 people accused of spying for Israel's Mossad, the judiciary said on Saturday. Some suspects were released after charges dropped, but most remain in custody. Officials warned they will punish the spies harshly and make examples of them. They promised to share more details once investigations finish. This move highlights Iran's tough stance against foreign espionage.

Recently, Iran executed nuclear scientist Rouzbeh Vadi for spying for Israel. Vadi was convicted of passing secret information about another scientist killed in June airstrikes. The airstrikes targeted Iran's nuclear program and top officials. The judiciary said the execution sends a strong message to other would-be spies. It also under...