The gunman who killed four people and wounded nine in a shooting rampage on the Pacific island of Saipan was identified Sunday as a Chinese national believed to be employed at the shooting range where the deaths occurred.

Li Zhongren, 42, who killed himself after Friday's shooting spree, left several notes and authorities suspect the violence was linked to his personal finances and frustrations.

The police statement was the first official confirmation of his identity and shed light on what might have precipitated the worst violence on this normally tranquil island in recent memory.

Police also said for the first time that he wounded eight South Korean tourists, and increase from the five police reported earlier. They were shot at a popular tourist site in what police earlier described as a drive-by shooting.

Santiago F. Tudela, commissioner of the Department of Public Safety, sent his condolences to the victims and their families.

"Our prayers are with you all," he said.

Public Safety spokesman Jason Tarkong said a motive is still being investigated by local authorities, the FBI and the Bureau of Alcohol, Tobacco and Firearms, but it "may be related to issues about money and the suspect's emotional frustration."

Detectives found several notes left behind by Li, who had lived at the shooting range in Kannat Tabla that had been closed earlier this year.

"The notes were left in plain view for police to find and the incident seems premeditated," he said in a statement.

The violence erupted late Friday morning at the shooting range where Li was believed to be working as the caretaker. Two adults, a 4-year-old boy and a 2-year-old girl were shot to death, and a 4-year-old girl was critically wounded.

The adult victims were identified as Enrique Naputi, 30, and Richard Borja Naputi, 22.

The 22-year-old victim's father, Ricardo Naputi, said the two men and three children were all related and residents of the U.S. commonwealth.

At a candlelight vigil held at Saipan's American Memorial Park Sunday, Ricardo Naputi said the victims were preparing to throw a birthday party for the 4-year-old girl injured in the attack when gunfire erupted. Richard Naputi had been asked to clean a yard behind the shooting range, his father said.

"He got a lot of plans. He was just at the wrong place at the wrong time," Ricardo Naputi said of his son. "This is very painful for us."