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On Sunday , 21 January 1855 , a " snowball riot " occurred in Trafalgar Square near St Martin-in-the-Fields in which 1,500 people gathered to protest against the war by pelting buses , cabs and pedestrians with snow balls .
 location: Trafalgar Square; location: St Martin-in-the-Fields
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 location: Trafalgar Square; location: St Martin-in-the-Fields