344496
On April 19 Baltimore was disrupted by riots , during which Southern sympathizers attacked Union troops passing through the city by rail , causing what were arguably the first casualties of the Civil War .
 location: Baltimore
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Baltimore 
Answer:
 location: Baltimore