This article is from the Mongolia FAQ, by Oliver Corff with numerous contributions by others.
Nobody hopes to run into emergency situations, but it is nonetheless
good to know which telephone number to call in case of a case. In
Ulaanbaatar, dial 101 for fire alarm, 102 for police, and 103 for
medical emergencies.
Ulaanbaatar is implementing a Japanese-style police system in the city
with little police booths in the residential areas. At least for long-
term residents it is advised to contact the nearest police booth and
enquire for their telephone number.
 
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