84947
They attack cities in southern England , including London , with a deadly heat-ray they fire from a camera-like device on an articulated arm attached to their tripods ; they also employ chemical warfare , using a poisonous " black smoke " launched from gun-like tubes .
 England, London
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 England, London