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In page Night fighter:

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Other forces did not have the pressing need to move to the jet engine; Britain and the US were facing enemies with aircraft of even lower performance than their existing night fighters.[citation needed] However, the need for new designs was evident, and some low-level work started in the closing stages of the war, including the US contract for the Northrop F-89 Scorpion.[2] When the Soviet plans to build an atomic bomb became known in the west in 1948, this project was still long from being ready to produce even a prototype, and in March 1949, they started development of both the North American F-86D Sabre and Lockheed F-94 Starfire as stop-gap measures.[3][4] All of these fighters entered service during the early 1950s.