Mario Toliver Sr., center, father of 17-year-old daughter Justice who was fatally shot by his 14-year-old son Mario Toliver Jr., is comforted by relatives outside a Chinatown residential building in Oakland, Calif., on Thursday, Jan. 23, 2014. Justice was the mother of a two-year-old girl. Toliver Jr. is at-large as the investigation continues. (Ray Chavez/Bay Area New Group)

OAKLAND -- A 14-year-old boy suspected of fatally shooting his 17-year-old sister Thursday afternoon remained at large Friday, even as the boy's family pleaded publicly for him to surrender.

Investigators believe that Mario Toliver Jr. shot and killed his sister at the family's Chinatown apartment shortly after noon Thursday, then fled the scene. Police said Friday they believed he might still have the weapon used in the shooting and that he shouldbe considered armed and dangerous.

The shooting occurred in a fifth-floor unit in the 800 block of Franklin Street. The victim was identified by Oakland police Friday as Justice Toliver, the mother of a 2-year-old daughter.

Family members said 17-year-old Justice Toliver, mother of a two-year-old daughter, was shot and killed in her family's Chinatown apartment Thursday afternoon. Oakland police said they are looking for her 14-year-old brother, identified by family as Mario Toliver Jr., in connecting with the slaying. (Courtesy of Marianna Gaston)

The apartment building was mostly quiet Friday, and people visiting the family declined to comment.

Family members issued a public plea Thursday evening for the boy to surrender peacefully.

"I love him, no love is lost," the children's grandmother, Wanda Brown, said Thursday night. "I know he's hurt right