CNN host Piers Morgan embarked on a tirade against “gun nuts” Friday afternoon, just hours after a shooting at Arapahoe High School in Colorado left one student in critical condition.

Morgan, who is a known proponent of strict gun control measures, sent out a series of tweets saying America’s refusal to “do anything about guns” is “shameful.”

Here are the tweets:

BREAKING NEWS: On eve of Sandy Hook massacre - another school shooting, in Colorado. Several students reported injured. #CNN
Piers Morgan Lashes Out at Gun Nuts in Wake of Colorado School Shooting
@piersmorgan
Piers Morgan
Why is anyone surprised by more school shootings in America? Absolutely nothing has been done to prevent them since Sandy Hook.
Piers Morgan Lashes Out at Gun Nuts in Wake of Colorado School Shooting
@piersmorgan
Piers Morgan
Colorado is, of course, where they've spent the last few months throwing out politicians who had the audacity to advocate gun control.
Piers Morgan Lashes Out at Gun Nuts in Wake of Colorado School Shooting
@piersmorgan
Piers Morgan
Gun nuts out in force on here again tonight. Angry, belligerent, threatening - the very people, ironically, who should never have guns.
Piers Morgan Lashes Out at Gun Nuts in Wake of Colorado School Shooting
@piersmorgan
Piers Morgan
The 1st priority of any country should be to protect its children. America's refusal to do anything about guns since Newtown is shameful.
Piers Morgan Lashes Out at Gun Nuts in Wake of Colorado School Shooting
@piersmorgan
Piers Morgan
As usual, the only suggestion put forward by the gun lobby to counter school shootings is...MORE GUNS! Ker-ching. @ #Colorado
Piers Morgan Lashes Out at Gun Nuts in Wake of Colorado School Shooting
@piersmorgan
Piers Morgan

No, I'm not 'anti-American' re guns. The opposite in fact.. I want more Americans to stay alive. #Guns #Madness
Piers Morgan Lashes Out at Gun Nuts in Wake of Colorado School Shooting
@piersmorgan
Piers Morgan

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