The National Security Council (NSC) Act 2016 which was gazetted on June 7 and enforced on Monday, will not be used to eradicate crime or check the Daish militant activities.

On the other hand, Inspector-General of Police Tan Sri Khalid Abu Bakar said, the Act would only be used when national security was threatened.

He said the NSC Act had nothing to do with the duties of the police, adding that it would only be used on matters relating to national security.

"Nevertheless, we have ample laws over the issue of crimes...we don't need this Act.

"We have the Prevention of Terrorism Act (POTA) 2015, and the Security Offences (Special Measures) Act 2012 (SOSMA), they are adequate for dealing with matters dealing with the Daish militants, and we don't need the NSC Act yet," he said.

READ: Police confirm receiving threatening letter against nation's leaders

Khalid was speaking to reporters after attending a Hari Raya Aidilfitri open house at the Selangor police contingent headquarters here Tuesday. Also present was Selangor police chief Datuk Abdul Samah Mat.

The NSC bill which provided for the setting up of NSC, declaration of security areas, powers of the security forces in the security areas and other related matters, was approved in the Dewan Rakyat on Dec 3, 2015 and Dewan Negara on Dec 22, 2015.

On another development, Khalid said the police viewed seriously and were investigating a threat-laced letter received by a police station in Negeri Sembilan, which was allegedly from the Daish militant group.

He said such threats did not weaken the spirit of the Royal Malaysian Police to continue carrying out their duty to safeguard national security.

"Indeed, we have received four to five of such letters and I feel the sender had posted them to Nilai, Port Dickson (both in Negeri Sembilan) and elsewhere, so we take note on that. We are trying to detect the sender of the letters which were sent by post," he added.

Khalid noted that only police stations in Negeri Sembilan had received such letters.

A Chinese language newspaper on Monday reported that a police station in Negeri Sembilan had received an envelope bearing the words, 'IS Threat'.

The two-page letter which contained elements of threats, among others contained the photos of Prime Minister Datuk Seri Najib Tun Razak; his deputy, Datuk Seri Dr Ahmad Zahid Hamidi; Khalid; Attorney-General Tan Sri Mohamad Apandi Ali; and Myanmar State Counsellor-cum-Foreign Minister, Aung San Suu Kyi.

The letter also claimed there were hundreds of Daish members in Negeri Sembilan, namely in Kuala Pilah, Nilai and Port Dickson.