A team of FBI investigators will arrive in Cambodia later this month to help police investigate the murder of opposition journalist Khim Sambor.

The team will include at least two sketch artists, said Phnom Penh Police Chief Brig. Gen. Touch Naroth.

Cambodian police and the FBI will meet one or two times a week to exchange information on the investigation, he said. Police met with an FBI official from the US Embassy last week, he said.

Khim Sambor was shot dead in Phnom Penh on July 11, along with his 21-year-old son, Khat Sarin Pheatha, two weeks ahead of national elections, and his killers are still at large.

Touch Naroth said Thursday the motive was not considered political, but police believe the killers were targeting Khim Sambor's son.

Khim Sambor's wife and two daughters were quietly granted asylum and fled to a Western country in late August, Chan Saveth, an investigator for the rights group Adhoc, said Thursday.