The so-called Ops 2020 project is a conspiracy theory claiming the government wanted to control institutions of higher leaning by ensuring the victory of pro-establishment student leaders in campus elections.

Also present during the press conference was IIUM Corporate Communication Division director Assoc Prof Dr Baharuddin Aziz.

"This fake letter was circulated by people who have malice in their minds and with intent to undermine the peace prevailing in the campus," Baharuddin said.

"A police report has been lodged at the Gombak police station this morning. Any student found to have been involved would be strictly dealt with."

On another matter, Najib questioned the sincerity of Perak DAP chairman Datuk Ngeh Koo Ham's apology over his recent controversial Twitter post.

The post had questioned Umno Youth's and other Muslims groups' intention to stage a protest against the anti-Islamic video clip Innocence of Muslims.

Ngeh had allegedly posted a question on whether Muslims were wasting their time and energy on the matter.

Najib said one could not just blurt out insensitive remarks against a religion without weighing the repercussions.

"We cannot simply make remarks and then retract and apologise when we realise the remarks could have stirred anger or were insensitive.

"If that is the case, we can also do the same, insult and ridicule and then later apologise," he said, adding that the incident showed DAP was insensitive on issues related to Muslims.

Umno deputy president Tan Sri Muhyiddin Yassin, meanwhile, said the damage (from Ngeh's tweet) had already been done.

"It showed Ngah and DAP have no understanding at all of Islam.

"It is only natural for some quarters to hold demonstrations to vent their anger when Islam is being demonised."