Yemen, the poorest of the Arab countries, has a population of 24 million. There are persistent anti-government protests. Activists say at least 30 demonstrators were killed by security forces overnight. Government forces have also launched a drive on a provincial capital, hoping to take it back from Islamist rebels. Yemen's president of 33 years, Ali Abdullah Saleh, is in Saudi Arabia, having suffered serious burns from an explosion inside his palace. Saleh is now calling for "peaceful dialogue." Robert Siegel gets an update on counter-terrorism activities in Yemen from Yemen expert and Princeton scholar Gregory Johnsen.