At least a dozen people were killed as the streets of Caracas, Venezuela, erupted into a night of riots, looting and clashes between government opponents and the National Guard late Thursday and early Friday, with anger from two days of pro-democracy demonstrations spilling into unrest in working-class and poor neighborhoods.

The attorney general’s office in Venezuela said 11 people had died of electrocution and gunshot wounds “in acts of violence” in El Valle, a neighborhood of mixed loyalties, where armored vehicles struggled to contain crowds of looters. In Petare, a working-class section in eastern Caracas, a protester was shot dead at the entrance to the city’s largest barrio, said Carlos Ocariz, the district mayor.

Throughout the night, the sounds of banging pots and pans reverberated through the capital, a traditional form of protest known as the “cacerolazo,” which has taken on greater significance as the country struggles with shortages of food.