I want to know the answer to the following question:
What is believed to have caused many civilian casualties from anti-aircraft guns?
All the background I'm provided with is that "Although the use of the guns improved civilian morale, with the knowledge the German bomber crews were facing the barrage, it is now believed that the anti-aircraft guns achieved little and in fact the falling shell fragments caused more British casualties on the ground.". Is that enough to answer the question?
Answer: yes