Venezuelan security forces have arrested Leopoldo Lopez, an anti-government protest leader, on charges of fomenting unrest that has killed at least four people, prompting tens of thousands of angry supporters to fill the streets of Caracas.<br /><br />Crowds of white-clad protesters stood on Tuesday in the way of the vehicle carrying Lopez, a 42-year-old Harvard-educated economist, after he made a defiant speech, said an emotional farewell to his family, and gave himself up to soldiers.<br /><br />Al Jazeera's Andy Gallacher reports from Caracas.
