Meanings

major tsunami warning

border police

police surgeon

police force

hazard area (flood, tsunami, etc.)

special precautions

alert dialog (dialogue)

weather warning

advisory level (1-5, 5 being the most severe)

security police

security police

cops and robbers (hide-and-seek game)

emergency alert

airborne early-warning system

to let down one's guard

Emergency Warning System (radio and TV broadcasts)

police affairs department

warning letter (e.g. of infringement)

security police

guard ship