Home Minister Hishammuddin Hussein today issued a stern warning to Hindu Rights Action Force (Hindraf) leaders P Waythamoorthy and his brother Uthayakumar against threatening the government.

He said the government viewed the duo's threats to hold street demonstrations seriously and would not compromise on national security.

"Once they convert the threats into something that (breaks the law) we will take action," he told reporters in Putrajaya.

Hishammuddin was commenting on the threat by Waythamoorthy, Hindraf's chairperson-in-exile, that mass demonstrations would be held if Uthayakumar was rearrested.

Uthayakumar was recently freed from Internal Security Act (ISA) detention but speculations of his re-arrest began after he refused to sign a document specifying conditions for his released.

Though Uthayakumar was released, speculation of his re-arrest intensified after he revealed that he was not attending an ISA advisory board panel hearing on May 19.

Following this, Waythamoorthy issued an ultimatum to Prime Minister Najib Abdul Razak to revoke the order for Uthayakumar to attend the hearing or Hindraf would declare "war" by staging a series of demonstrations.

'Uthaya need not attend hearing'

Commenting on this, Hishammuddin said that it was not compulsory for Uthayakumar to attend the hearings.

"I was told that his presence at the ISA advisory board is not a condition for his release. The board had asked the detainees to attend to assess their rehabilitation process.

"If he was not present, it would be reflected on the report (but) it does not violate any conditions that allows us to take action," he said, adding that the board would submit the report to him.

Asked on Uthayakumar's refusal to sign the conditions for his release, Hishamuddin replied: "I have checked on the legal aspect of this even before his release. The fact that he didn't sign it is not something that is against the law. It would not affect his release.”

Inspector-general of police Musa Hassan has refused to reveal the conditions, but Uthayakumar has disclosed that among others, there were conditions prohibiting him from speaking at public functions and going to his hometown of Seremban.