Venezuela’s Opposition-run congress accused the police on Friday of illegally raiding the headquarters of a non-governmental organization that supports their plan to bring humanitarian aid into the country and confiscating medicine and baby milk.

The Opposition, whose leader Juan Guaido has been recognised by more than 40 countries as Venezuela’s legitimate leader, is rallying foreign relief for the country to alleviate food and medicine shortages in the wake of an economic collapse, and has vowed to bring supplies into the country on Feb. 23.

Increasingly isolated President Nicolas Maduro denies there is a humanitarian crisis and says the aid effort is just an attempt to justify US intervention in Venezuela.

Some NGOs have warned of politicizing aid, while others say they will support the opposition’s efforts given the extreme needs in some sectors of society.