Authorities say one person was killed and nine others were wounded when someone opened fire at a party on a basketball court in Detroit. Assistant Police Chief Steve Dolunt said 400 people - including families with children in strollers - had gathered for a neighborhood party when shots were fired at about 8:30 p.m. Saturday. A 20-year-old man was killed, Dolunt said, adding that police do not know the reason for the shooting. The victims ranged in age from 21 to 46, he said, and three of them were women, AP reported. Cassandra Lewis, the department's spokeswoman, said a 46-year-old man was in critical condition but the rest of the victims had injuries that were not life-threatening. She said no one has been arrested for the shootings yet.