MADRID, March 7 (Reuters) - Spain will send the United Nations' Palestinian refugee agency UNRWA an additional 20 million euros ($21.88 million) in aid, Foreign Minister Jose Manuel Albares said on Thursday.

This will be on top of the 3.5 million euros the country has already pledged in February.

($1 = 0.9142 euros) (Reporting by Pietro Lombardi, editing by Inti Landauro)