KUALA LUMPUR, July 9 — The Malaysian Communications and Multimedia Commission (MCMC) will carry out an investigation to find the culprit behind a false security alert of global terror group Islamic State's (IS) purported targets in Malaysia, its minister Datuk Seri Salleh Said Keruak said.

Salleh Said was referring to an alleged security alert circulating on social media yesterday that warned the public to stay away from a list of nine locations in the Klang Valley.

"We are very concerned with the false and unverified security alert because it creates unnecessary tension to the people and to the harmony of our nation.

"MCMC is going to work very closely with PDRM to investigate the incident to identify the culprit who made the irresponsible false statement and alert,” he told Malay Mail Online when contacted yesterday.

"We are going to make the necessary arrangement for a public service announcement related to the security of the public especially related to the terrorist threat,” he added.

Yesterday, the Inspector-General of Police Tan Sri Khalid Abu Bakar clarified on his official Twitter account that the alert did not originate from the police force.

The alleged security alert claims the Malaysian government has confirmed the IS will mount an attack on the places in the list which included tourist attractions like the KL Tower, popular shopping malls and LRT stations.

It also claimed that Malaysia is the "next target for bombing according to special branch,” referring to the police intelligence unit.

Earlier this week, Khalid confirmed that the June 28 grenade attack which injured eight people at a bar in Puchong was the first successful attack in Malaysia linked to the IS.

Khalid said the 15 Malaysian male suspects arrested following the attack were believed to have either been planning or received instructions to attack entertainment outlets which they deem "un-Islamic,” as well as senior members of the government, police force and judiciary.

Transport Minister Datuk Seri Liow Tiong Lai had on Wednesday said that security will be tightened at all airports and train stations nationwide, with airport-like screening at the KL Sentral hub to be used on all passengers headed to the airports.