The 2024 U.S. National Institute of Standards and Technology (NIST) Speaker Recognition Evaluation (SRE) is the latest in a series of SREs conducted by NIST since 1996. The SRE24 evaluation task was automated person detection and had three evaluation tracks: audio, visual, and audio-visual. New SRE24 features included: variable duration enrollment segments, shorter duration test segments, segments containing multiple persons, and updated cost function parameters. 11 teams consisting of 26 sites participated in SRE24. Evaluation results indicate audio-visual fusion produces significant performance improvements over audio or visual systems. Further audio results analyses indicate: use of unrestricted training data produced significant performance gains; some systems performed better using three 10s segments than three 60s segments for enrollment data, with overall differences being less than expected; and, single model systems performed competitively with the fused multi-model systems.