- Summary- Protester, 23, is second to be executed within a week- Activists say executions are aimed at discouraging dissent- Call for added nationwide protests over Rahnavard's hanging- European Union to impose more sanctions on Iran, backs protests- Tehran accuses the West of meddling, targets it with sanctionsDUBAI, Dec 12 (Reuters) - The Islamic Republic on Monday hanged a man in public who state media said had been convicted of killing two members of the security forces, the second execution in less than a week of people involved in protests against Iran's ruling theocracy.Mizan published pictures of the execution at dawn, showing Rahnavard hanging from a construction crane, with his hands and feet bound and his head covered with a black bag.The Basij force, affiliated with the elite Revolutionary Guards, has been at the forefront of the state crackdown on protests.State television showed a video in which Rahnavard said in the court that he came to hate the Basij forces after seeing them beating and killing protesters in videos posted on social media.The European Union's foreign policy chief Josep Borrell said on Monday the EU will agree on a "very tough" package of sanctions against Iran to show its support for peaceful protesters."