PUTRAJAYA, July 14 -- The Home Ministry has launched a comprehensive investigation into the operations of Network School in Forest City following concerns over alleged immigration irregularities.

The ministry said in a statement today that the investigation followed claims that individuals had used passports from a second country to enter Malaysia.

"The Home Ministry takes seriously any matter involving national security, compliance with immigration laws and the misuse of Malaysia's immigration facilities," it said.

The ministry said the Immigration Department, police and other relevant agencies were examining the identities and nationalities of those involved, as well as the validity of their travel documents.

The investigation will ...