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Mixed
Flat
The shine of small things
time, Alarm, Alert
Black
512x512
Outline
Random - Crafticons
Misc, Alert
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Filled outline
Line color mix Vol.1
Megafone, Loud, megaphone
Line color mix Vol.2
Attention, Megafone, Alert
Mayssam
Error, Alert, danger
Glyph
Basic icon element
danger, warning, safety
Free Misc Icon Set 2
Alert, problem, exclamation
Error, sign, fill
Error, Alarm, warning
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Web Icons
Alert, ring, notification
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Office Vol.2
Loud, Alert, megafon
MediumTurquoise
Office Vol.3
Clock, watch, Wait
DimGray
speaker, Broadcast, Alert
watch, time, Alert
Twitter UI Set
Alert, notification, ring
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Things
gold, bell, church
Goldenrod
bitsies!
warning, Alarm, Alert
fault, problem, Error
Cartoon
Monochrome Icon
Calendar, watch, timer
Silver
478x512
Amenities - Outline
fire, Alarm, Alert
Krispicons- Modern Flat Icons Freebie
timer, Horn, Alert
Purple
111x111
Attention, danger, Caution
Firebrick
Handdrawn
Social Messaging & Productivity
danger, Attention, Error
Alarm, compass, Alert