Cuba’s government on Monday confirmed that it had recently met with U.S. officials on the island as tensions between the two sides remain high over the U.S. energy blockade of the Caribbean country.

Senior U.S. State Department officials, speaking on condition of anonymity, had said on Friday that American diplomats flew earlier in April to the island for the first time since 2016 in a new diplomatic push. Neither U.S. nor Cuban officials have said exactly when the meeting took place nor which U.S. officials took part.