Opposition leaders Mir Hossein Mousavi and Mehdi Karroubi in Iran were placed under house arrest ahead of Monday’s protests. Earlier today, a large group of lawmakers called for their execution. Press TV has aired video of lawmakers chanting, “Moussavi, Karroubi… execute them.” The security crackdown in Iran comes just days after the Iranian government claimed to support the popular uprisings in Egypt and Tunisia. Meanwhile, protests continue across the Arab world.