On Thursday, Human Rights Watch urged both coalition parties to "rein in their supporters," who it said had graduated from egg-throwing and paint-smearing to physical assaults and bomb attacks.
And along with the violence, the group said that cyberattacks had been directed at a number of Malaysian news websites, restricting access to reporting on the election within the country.
"Ensuring everyone can access information without interference is critical if there is to be a level political playing field in Malaysia," said Phil Robertson from Human Rights Watch. "The government has a duty to investigate and shut down all cyberattacks, interference with ISPs, and hacking so that freedom of expression and the right to receive information is preserved."
Foreign investors were anxious about the election outcome because despite concerns about Malaysia's gaping fiscal deficit, the country's economy has performed relatively well amid the global slowdown.
The World Bank expects Malaysia's GDP to grow 5% this year, boosted by capital projects and domestic spending, as citizens make use of civil servant wage increases and government handouts.