OFFICIALS say that international funders have been supporting the so-called Tiger Head Movement - the mysterious organisation that the government claims masterminded a failed bomb attack in Phnom Penh early this month.

"I cannot confirm whether we expect more arrests or not [because] this is also about people funding the organisation from abroad," Information Minister Khieu Kanharith said Thursday, adding that police were looking for more suspects.

National Police spokesman Kieth Chantarith said police were still investigating the case.

"We expect more arrests," he said, not elaborating further due to the sensitivity of the case.  

Four persons are currently detained in PJ prison in connection with bombs discovered January 2 and on suspicion of recruiting and training terrorists.

In Mondulkiri province, where the former provincial police chief Reach Samnang was arrested Thursday last week, police said that 300 RCAF soldiers have been deployed to search for more members of the alleged anti-government movement.

"It is very hard for me to answer questions, but we are hunting for the suspects," So Sovann, deputy Mondulkiri police chief, said Thursday.

Kieth Chantarith reiterated that the four in detention had connections to five people jailed for a 2007 attack on the Cambodian-Vietnamese Friendship Monument.

"The four suspects are from the same group as the five sentenced for the bombs planted at the [monument] in 2007," he said, declining to provide further details.