WASHINGTON—The game between the San Diego Padres and Washington was suspended in the sixth inning Saturday night after a shooting outside Nationals Park that caused echoes of gunfire inside the stadium and prompted fans to scramble for safety in the dugout. The shooting, an exchange of gunfire between people in two cars, left three people injured, according to Ashan Benedict, the Metropolitan Police Department’s executive assistant police chief. One of the people who was shot was a woman who was attending the game and who was struck while she was outside the stadium, he said. Her injuries weren’t considered life-threatening. Two people who were in one of the cars later walked into a local hospital with gunshot wounds and were being questioned by investigators, Benedict said, and the extent of their injuries wasn’t immediately clear. Investigators were still trying to locate the second vehicle involved in the shooting. The gunshots …