The Obama administration has proposed two new federal gun control rules to ensure more information about the mentally ill reaches background check databases, after a series of high-profile US shootings.
The rules come on top of a series of executive actions President Barack Obama announced after the Newtown, Connecticut school shooting that left 20 young children and six staff dead in December 2012.
The massacre relaunched a push for gun control laws in America and a handful of states have since tightened gun rules.
But the national measures Obama sought, including a plan for enhanced background checks on gun buyers and a ban on assault-style rifles, failed in the US Senate in April due to fierce opposition from gun rights supporters.
In the first nine months of 2013 following a presidential directive, federal agencies have provided more than 1.2 million records identifying persons prohibited from buying or owning guns for mental health reasons, the White House said.
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The figure is a 23 per cent increase from the number of records that federal agencies had made available by the end of January 2013.
Under the new rules proposed by the departments of Justice and Health and Human Services, the federal background check database would be able to access some mental health records, due to an exemption to existing privacy law.
The Justice Department is also proposing to "clarify" that people involuntarily held at inpatient and outpatient institutions should be barred from buying guns.
"Too many Americans have been severely injured or lost their lives as a result of gun violence," the White House said.
"While the vast majority of Americans who experience a mental illness are not violent, in some cases when persons with a mental illness do not receive the treatment they need, the result can be tragedies."
