Venezuelan president shut frontier last year on security grounds.
President Nicolas Maduro is accused of deliberately delaying the recall referendum to January next year.
The opponents of Venezuela's president gather enough voter signatures to take recall campaign to next stage.
Country hit by severe shortage of food, medicine and other supplies.
Opposition blames economic woes on the government's poor policies.
Demonstration calling for officials to expedite recall motion turns violent.
The opposition seeks urgent political transition through a recall referendum against Maduro.
Announces nationwide power rationing for four hours a day.
President Nicolas Maduro says special powers needed to deal with perceived threat by United States.
The government said it needed to halt a U.S.-backed operation.
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