Riot police use water to disperse opposition demonstrators as they block the city's main highway during a protest against Nicolas Maduro's government in Caracas on February 14. President Maduro's government kept dozens of student protesters behind bars on Friday as unrest still rumbled across Venezuela following this week's violence at political rallies that killed three. Demonstrators gathered again in various cities, blocking roads and burning tires in some cases, to denounce the repression of protests and make a litany of complaints against Maduro ranging from rampant crime to shortages of basic products.  Reuters/Carlos Garcia Rawlins