KUALA LUMPUR, MALAYSIA: Malaysian Prime Minister Najib Razak has defended strict security laws to fight terrorism as the Islamic State group warned of revenge over a crackdown on its members.

PM Razak said the terrorism threat is "very real" and that the laws are crucial to ensure Malaysia is not open to infiltration.

Opening a two-day counter-terrorism conference, Najib said Monday that "the best way to uphold civil liberties is to ensure the safety of the nation."

"There are no civil liberties under Daesh and there are no shields against those who are set on committing acts of terrorism. The best way to uphold civil liberties is to ensure the safety of the nation," Najib said.

Daesh is the term used by some to refer to the Islamic State group.

Najib said digital media has emerged as the new frontier in the anti-terror war to counter the "seductive approaches of the militants" and their lies about Islam.

Human rights activists have slammed a law implemented last year that revives detention without trial. Critics also voiced fears that another law approved last month that gives sweeping powers to a council led by the prime minister could be a step toward dictatorship.

Police earlier said the Islamic State group had posted a video that warns of attacks over the arrest of its members.

Ayob Khan Mydin Pitchay, who heads the national police counter-terrorism unit, said on the sidelines of the conference that the video carried the Islamic State logo and featured two Malaysians based in Syria. He said there were previous videos with similar warnings before but this was the first video with a logo of the militant group.

"They threaten to carry out attacks in Malaysia" if their members are not released and more are arrested, said Ayob, vowing that police will step up their operations.

On Sunday, police said they had detained seven men suspected of being an Islamic State militant cell that was plotting attacks. The seven Malaysians were detained in several states over three days after the January 15 detention of a man police said was planning a suicide attack in Kuala Lumpur.

Police also seized bullets, jihad books and Islamic State flags and videos.

Malaysia raised its security alert level following the January 14 attacks in neighboring Indonesia that left seven people dead.