Gunfire erupted at a fraternity and sorority picnic in a park, and two men were killed and four people wounded, police said.
One man was arrested, and police were looking for others, authorities said.Police said they did not know what prompted the shooting Sunday.
Witnesses said dozens of shots were fired, and several people were seen carrying guns.
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About 200 students from around the state had gathered at the park in Van Nuys, about 15 miles northwest of downtown Los Angeles, for the African People's National Pan-Hellenic Greek Show, police said.