Jakarta – Newly appointed National Police chief detective Insp. Gen. Sutarman admits police are unable to resolve a large portion of cases they are tasked to investigate.

"Investigators solve around of 60 percent of cases reported by the public," Sutarman said Monday. He added that the main factors hindering police from resolving cases satisfactorily were a lack of eyewitnesses and evidence.

"Cases can be brought [to court] when evidence and testimonies are avaiable," he said. "[But] what can we do if it is difficult to find evidence?" he added, as reported by tribunnews.com.

Earlier, Indonesia Police Watch (IPW) released data on police investigation of corruption cases. The study revealed no progress had been made on 20 corruption cases, one of which was filed eight years ago.

"The [cases] are worth hundreds of billions [of rupiah]. The police are not serious in investigating them," IPW chief Neta S. Pane said Sunday as quoted by tribunnews.com.