Speaking at a press conference in Colombia, Almagro said that about 285 people have suffered injuries in clashes near the Santander and Simon Bolivar bridges, connecting Venezuela with Colombia and temporarily closed on 22 February by Caracas; and around 50 others were injured near the city of Santa Elena de Uairen, located close to the Brazilian border.
Prior to that, Colombian Foreign Minister Carlos Holmes Trujillo said that most of the injured had been affected by the use of tear gas.
Amid Saturday's attempts to force unauthorised aid deliveries into the country, Caracas severed diplomatic and political relations with Bogota.
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Moscow, which has endorsed Maduro as Venezuela's legitimate president, has also warned that unauthorised deliveries of foreign humanitarian aid to the Latin American country would be a provocation, which could be used as a pretext for military action against the legitimate Venezuelan government.