MILWAUKEE—Twenty people were injured in two shootings in downtown Milwaukee near an entertainment district where thousands had been watching the Bucks play the Celtics in Game 6 of the NBA’s Eastern Conference semifinals, authorities said.

None of the injuries from either shooting after Friday night’s game were believed to be life-threatening.

The first shooting, involving three victims, occurred adjacent to the Deer District—an entertainment district with numerous bars and restaurants where large crowds often assemble to watch major sporting events.

The Milwaukee Fire Department said authorities took two people to a hospital, a 30-year-old man and a 16-year-old girl, and a third person drove to a hospital. Police said a 29-year-old man was in custody.

Seventeen more people were injured in a second shooting about two hours later, which happened a few blocks away. Ten people were taken into custody and nine guns were recovered, WTMJ-TV reported.

There was no immediate indication whether the two shootings were related or involved fans who were watching the game.