No one was hurt in the incident, although a warning note was left behind.
Engineering student Siti Aishah Shaharudin told the Star Online that the incident occurred at around 3.30am when a loud explosion was heard in her front porch.
"We heard a motorcycle pass by the house but we didn't suspect anything until we heard a loud explosion and we saw flames spreading," she said.
While checking the compound of the house after the explosion, Aishah discovered a note clipped to one of the students' car windshield.
It said: "Tarik diri atau mati" (withdraw or die).
Some of her fellow housemates, are contesting today's student elections under the Pro-Mahasiswa banner.
"We do not know who the culprit is. But we suspect it has something to do with the election," she said.
A police report was lodged at the Bandar Baru Bangi police station at 4am.
The UKM campus election is currently underway for 2013/2014 session.
In an immediate reaction, vice-chancellor Prof Tan Sri Dr Sharifah Hapsah Syed Hasan Shahabudin said no extra security measures would be taken in the university since the incident happened outside of the campus.