This was a potentially embarrassing international incident, as it revealed that the United States had supplied the British with Shrike missiles. British diplomats negotiated for the release of the Vulcan and its crew, who were interned at Galeão Air Force Base. A deal was struck on 4 June under which they would be released in exchange for spare parts for Westland Lynx helicopters. Brazil came under pressure from Argentina, and the United States agreed to intervene to preserve the secrets of the Shrike missile. The crew and aircraft were permitted to fly to Ascension on 10 June. A new refuelling probe was fitted there, and the aircraft flew back to Waddington on 13 June. The remaining Shrike missile remained in Brazil.