Opposition demonstrators clash with riot police during an anti-government protest in Caracas, on July 20, 2017. 
A 24-hour nationwide strike got underway in Venezuela Thursday, in a bid by the opposition to increase pressure on beleaguered leftist President Nicolas Maduro following four months of deadly street demonstrations. / AFP PHOTO / JUAN BARRETO        (Photo credit should read JUAN BARRETO/AFP via Getty Images)