United States President Barack Obama has urged to limit access to firearms after a shooting at the Planned Parenthood clinic in Colorado claimed three lives and nine others injured overnight.

The motive for the assault on the clinic, which is run by a non-profit group and known to perform abortions, remains unclear, according to Obama.

The President previously called on the Congress to change the country’s gun laws and urged the US citizens to pay more attention to presidential candidates’ positions on gun control.