It added that the US government was “not alone in its concern”, saying that six governments including Cambodia had taken “enforcement action” against RIHS branches in their countries.

In February, The Post reported that RIHS was listed in a 2008 US treasury department statement claiming it had delivered “financial and material support” to al-Qaeda and al-Qaeda affiliates such as Jemaah Islamiyah, as well as providing “financial support for acts of terrorism”.

The statement noted that an RIHS employee had provided logistical support to Indonesian Riduan Isamuddin – better known as Hambali – a key JI operative who hid in Phnom Penh during 2002 and early 2003.

Ahmad Yahya, a Cham government adviser, denied the authorities had cracked down specifically on any organisation, saying the only firm action was directed against the Saudi-funded Um Al-Qura madrasa, or Islamic school, north of Phnom Penh.

The madrasa was raided and closed down by police in 2003.

Ahmad Yahya said the US Embassy had provided substantial support for outreach to Islamic communities following the terrorist attacks of September 11, 2001.

“We have very good links with the embassy here and with the US government,” he said.

The cable is just one of more than 250,000 leaked American foreign policy documents WikiLeaks has pledged to release in the coming months. A total of 931 documents had been released as of yesterday.

US Embassy spokesman Mark Wenig yesterday declined to comment on the cable and the nature of US cooperation in curbing the spread of Islamic militancy in Cambodia.