PNG ICO ICNS SVG MORE
Mixed
Smooth
Tango Icon Library
warning, Dialog
Black
512x512
PNG ICO ICNS MORE
Gaming & gambling
3D
Free Game Icons
warning, Blaze, Attention
64x64
danger, Explosion, Bomb
Photography & graphic design
32x32 Free Design Icons
warning
32x32
Photorealistic
48x48 Free Object Icons
Alert, fire, combust
48x48
bombshell, Bomb, war
Business & finance
Glyph
48x48 Free Time Icons
warning, medicine, siren
PNG MORE
Pixel
24x24 Free Pixel Icons
24x24
24x24 Free Application Icons
stop, Abort, Block
UI
Snipicons
warning, sign
Iconza
Signs & symbols
Free 3d Glossy Interface Icon Set
Attention, Error, cautious
Hand, warning, Abort
warning, danger, Alert
Prompt, danger, exclamation
Prompt, help, danger
Desktop apps
Farm-fresh
warning, compile