(Reuters) -A quarrel among several people sparked the shooting spree in Kansas City, Missouri, that killed a woman and wounded 22 people after a celebration of the city's NFL Super Bowl victory, police said on Thursday, discounting any apparent link to extremism. Two juveniles and an adult were being held as suspects, Police Chief Stacey Graves said at a press conference on Thursday, a day after gunfire erupted in the vicinity of the city's historic downtown rail station. Graves said the catalys