A woman performing the national anthem before an NBA preseason game in Miami on Friday night did so while kneeling at midcourt, and opening her jacket to show a shirt with the phrase ''Black Lives Matter.''
The singer was identified by the Heat as Denasia Lawrence. It was unclear if she remained in the arena after the performance, and messages left for her were not immediately returned.
Heat players and coaches stood side-by-side for the anthem, all with their arms linked as has been their custom during the preseason. Many had their heads down as Lawrence sang.
The anthem issue has been a major topic in the sports world in recent months, starting with the decision by San Francisco 49ers quarterback Colin Kaepernick to not stand for its playing. Kaepernick cited racial injustice and police brutality among the reasons for his protest, and athletes from many sports - and many levels, from youth all the way to professional - have followed his lead in various ways.