CUCUTA, Colombia (Reuters) - A convoy of trucks carrying humanitarian assistance for Venezuela will be unloaded at the Simon Bolivar bridge on Colombia's side of the border and the aid will be transported by a human chain across the frontier, Colombia's migration agency said on Saturday.

Venezuela's armed forces have been ordered by President Nicolas Maduro to block the aid from crossing into his impoverished South American nation, despite widespread shortages of food and medicine.

(Reporting by Helen Murphy; Editing by Daniel Flynn)