Scientologist and actress Kirstie Alley has taken to Twitter to say the common denominator of mass shooters- beyond guns- is psychiatric drugs.

Alley's series of tweets was unleashed less than a day after Stephen Paddock, 64, shot and killed 58 people during a country music festival in Las Vegas.

'We have to solve the mystery of why there were no 'shooters' or almost 0 before the 1980's. I know one common denominator other than guns,' Alley tweeted Monday, suggesting Paddock opened fire due to his use of prescription drugs.

Las Vegas killer Stephen Paddock was prescribed an anti-anxiety medication four months ago.

Paddock was prescribed 50 10 milligram diazepam tablets - also known as Valium - on June 21 by Vegas doctor Steven Winkler, the Las Vegas Review-Journal reports.

Diazepam is a sedative-hypnotic drug that can trigger aggressive behavior in people with underlying behavioral problems, multiple studies have shown.

It is not known why Paddock was prescribed the drug, or whether he had any behavioral issues.

Kirstie Alley unleashed a series of tweets about the Las Vegas shooting. The Scientologist and actress placed blame on the use of psychiatric drugs for the horrific event

The tweet storm from Alley began less than a day after the mass shooting in Las Vegas

'One additional common denominator of 'shooters' is USA's mass usage of psychiatric drugs'

'One additional common denominator of 'shooters' is USA's mass usage of psychiatric drugs. A % do have side effects of VIOLENCE & SUICIDE,' continued the outspoken actress and Scientologist.

Twitter users were furious at the 66-year-old's comments on the tragedy. One person tweeted back: 'Did you really just say that?'

Not one to clam up, Alley promptly responded 'Yes I did say it. It happens to be a common denominator in shooters… one that didn't exist before the 80's… not my opinion. Statistic based.'

'It's an actual bonified black box warning label on these drugs as possible side effects. VIOLENCE & SUICIDE.'

The Sunday evening massacre in Las Vegas left 58 people dead and over 500 people injured

Alley caught backlash from Twitter users who were shocked to read her tweets following the violence that left 58 people dead

She also said that suicide and violence are side effects of the medications, alluding to the shooters own suicide before police entered his hotel room

Paddock shot himself in his hotel room before police arrived.

Alley is one of several celebrity Scientologists who have spoken out against using psychiatric medications. Tom Cruise had previously criticized Brooke Shields for her use of medication to treat her postpartum depression.

'Prayers & condolences aren't enough anymore,' said the star after voicing her controversial opinions.