An anti-government demonstrator is held on the ground along with others, as he is detained by the Bolivarian National Guard, during clashes at a protest in Caracas, Venezuela, Wednesday, May 14, 2014. Members of Venezuela's opposition pulled out of crisis negotiations with the government as security forces arrested scores of people in fierce clashes with demonstrators. (AP Photo/Alejandro Cegarra)CARACAS, Venezuela (AP) — Venezuelan security forces arrested scores of people on Wednesday during a sweep of a busy Caracas avenue as protests against the government stepped up even as a rift opened within the opposition over whether to back U.S. sanctions.

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