26 people have died in a wave of protests this month in Venezuela.
Previous attempts to reach the city center have degenerated into clashes between riot police and stone-throwing protesters.
Police officers charge an anti-government protesters in Caracas, Venezuela, Monday, April 24, 2017.
But, as the state security forces lean more heavily on tear gas, the protesters have begun gearing up with goggles, gas masks and vinegar-soaked rags.
The Washington-based organisation said earlier on Tuesday that its permanent council would hold a meeting on Wednesday "for the "Consideration of the draft resolution convening a Meeting of Consultation of Ministers of Foreign Affairs" on the situation in Venezuela".
Venezuela threatened to withdraw from the Organisation of American States (OAS) last night as pressure mounted over increasingly violent protests spreading across the country.
Maduro is not willing to continue "allowing legal and institutional violations, nor arbitrariness that surpass any moral threshold".
A 23-year-old man was shot in the head in overnight protests in Venezuela, prosecutors said Tuesday, the 25th person to die this month in unrest sparked by a political crisis..
Maduro is accused of eroding democracy and plunging the oil-rich economy into chaos; over the previous year citizens have suffered from food shortages and a lack of basic services as crime rises. The ruling was later partially reversed amid a storm of worldwide criticism.
Opposition leaders have blamed armed pro-government militias known as "colectivos" for a number of the deaths, while government officials have accused the opposition of working with criminal gangs to foment unrest.
On Sunday, a 21st death was linked to the unrest that began nearly a month ago over the Supreme Court's decision to gut the opposition-controlled congress of its powers. Venezuela's opposition called for a new march against Venezuelan President Nicolas Maduro for Wednesday. It excludes Canada and the U.S.