(01-24) 18:33 PST SAN FRANCISCO -- Relatives and police Friday called on a 14-year-old boy to surrender in connection with the fatal shooting of his 17-year-old sister in Oakland's Chinatown.

Justice Toliver was shot in the family's fifth-floor apartment on the 800 block of Franklin Street about 12:15 p.m. Thursday, police said. She died at the scene, said Officer Johnna Watson, a police spokeswoman.

Watson said police were searching for the victim's brother, Mario Toliver. Family members and acquaintances said he had shot his sister and that the two had been arguing but were actually very close.

"Typically, we do not release the name of a juvenile, but the law does allow us to do it, especially in a case where public safety is concerned," said police spokeswoman Officer Johnna Watson. "We do know that a firearm was used in (Thursday's) homicide. We have not recovered that firearm. We believe he may still have it. We are considering him armed and dangerous."

Juanita Walton, a friend of the siblings' mother, said the two lived in the apartment with their grandmother and were "really feuding." The fighting stemmed in part, she said, from when Justice Toliver "bleached his clothes the other day."

Family members said she had a 3-year-old daughter and worked at a McDonald's. "She was a beautiful kid, a beautiful young lady," Walton said. "She was just your typical kid.

"It's sad for two siblings to go at it like that," Walton said. "They're both just kids. And where did he get the gun? Who gave that little boy a gun?"

Wanda Brown, the siblings' other grandmother, had a message for Mario Toliver: "Grandson, Grandma Wanda is asking you, please do the right thing. Please. And I love you. I love you with all my heart."

Brown said that although sister and brother had bickered, they were "two peas in a pod." They loved to shop, watch movies and sing together, she said.