US military planes carrying humanitarian aid for Venezuela have arrived in the Colombian border town of Cucuta.
The aid is being stockpiled at the request of the Venezuelan opposition leader, Juan Guaidó, who declared himself interim president last month.
President Nicolás Maduro has alleged the aid is part of a US plot.
Mr Guaidó says Venezuelan volunteers will carry it across the border on 23 February.
Speaking at a news conference in Cucuta, a USAID administrator, Mark Green, said the aid had been requested by Mr Guaidó because Venezuela was in the grip of a growing humanitarian crisis.
"Children are going hungry, and nearly every hospital in Venezuela is experiencing serious medicine shortages."