U.S. President Donald Trump gives a thumbs-up as he arrives at Miami International Airport in Florida on April 11. [REUTERS/YONHAP]

U.S. and Iranian negotiators have reached an agreement on a 60-day memorandum of understanding to extend their cease-fire and conduct negotiations on Iran's nuclear program, but U.S. President Donald Trump has not yet given his final approval, a report said on Thursday.

Axios, a U.S. news outlet, reported on the agreement, citing two U.S. officials and a regional source, as tensions flared anew with the Islamic Republic firing a ballistic missile toward Kuwait on Thursday in retaliation for earlier U.S. strikes on targets in southern Iran.

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As of Tuesday, the terms of the deal were mostly agreed to, but both sides still needed approval from their top leaders, Axios said, citing U.S. officials.