Abdifaith Said, 23, was taken into custody in City Heights about 10 a.m., according to Chula Vista police. Said and the other two suspects, Abdulaziz Mohamed and Adbiwahab Noorein, both 21, are expected to face attempted murder charges and possibly other counts in connection with the early-morning gun violence, Lt. Roxana Kennedy said.Killed at a large apartment complex in the 400 block of Oaklawn Avenue in Chula Vista about 3 a.m. last Friday were Christina Selmon, 20, and 17-year-old Hopeton Bennett. Julian Velasquez, 21, suffered a non-life-threatening gunshot wound to the face.Mohamed, Noorein and Said, who are believed to have gang ties, were arrested in the shooting of Velasquez, Kennedy said. Citing ongoing investigations in the case, the lieutenant declined to say if detectives had identified the suspected killer or killers of the young Chula Vista woman and the San Diego teen.Kennedy also would not discuss how the shootings appeared to have played out or disclose a possible motive, except to say that they apparently took place during an argument that broke out at a social gathering.The three victims were visiting friends at the large residential complex on the night of the shootings.The deadly violence may have been related to a disturbance that occurred at the same address two days earlier, police said. Neighbors reported hearing loud arguments from inside the residence on several recent occasions.Since the complex includes about 350 apartments, detectives suspect that there are witnesses to the shootings who have yet to report what they saw."So we're asking that anyone who has any information, even if they think it's insignificant, that they come forward with it," the lieutenant said.The three suspects, who are of Somali descent, are San Diego residents, according to police.