18504
On 16 May , further bombing attacks were made against the column when it was attacked by the " Luftwaffe " , again no damage was sustained but there were a few casualties .
 organization: Luftwaffe
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: Luftwaffe 
Answer:
 organization: Luftwaffe