Forms of emergency:

• fire
• crime such as a violent crime in progress
  • note that a "cold" crime, even if serious, may no longer be an emergency
• medical emergency
• maritime emergency
• state of emergency declared by a government official during some disaster such as a terrorist attack or declaration of war or
• natural disasters such as:
  • floods
  • earthquakes
  • tornadoes
  • volcanic eruptions
  • tsunami