The answer to the OP’s question is a resounding yes.
It is almost impossible to hit a fast-moving aeroplane with artillery, and the shells which did explode rained down hundreds of thousands of heavy chunks of metal.
These caused many deaths, but even worse was the fact that many of the shells had defective timing mechanisms. This meant that instead of exploding 10,000 feet overhead, they plunged to earth and exploded there.
One expert working at Cambridge’s Cavendish Laboratory estimated that half the shells exploded at ground level and that they killed as many people as the German bombs.
If true, this would mean that the British army and their artillery were responsible for over 25,000 deaths in Britain during the Second World War.
Beginning on Sunday, 8 September 1940, when an artillery shell landed outside a café near Kings Cross, killing 17 people, the death toll from anti-aircraft fire was constant and unrelenting.
Nor were the deaths limited to London. On 14 September 1940, members of the Women’s Royal Naval Service were sitting down to dinner at the hotel in Lee-on-Solent where they were billeted.
A shell fired by artillery in Portsmouth flew through the window of the dining room and exploded, killing 10 of the young women.
In some areas of the country, there is no doubt that more people were killed by shells than bombs.
In the Midlands district of Tipton, 23 civilians were killed during air raids during the Second World War. 11 of these deaths were caused by German bombs, but 12 died during an incident on 21 December 1940, when a wedding party was taking place in a pub in the village of Tividale.
An artillery shell weighing 28 lb (12.7 Kg) was fired from nearby Rowley Hills and sailed down the chimney of the building where the party was being held. The bride was killed, the bridegroom lost both legs and 11 other guests died.
The strange thing is that during the war, the number of injuries and deaths from anti-aircraft fire was common knowledge and widely reported in both national and provincial newspapers, despite the censorship. On 29 March 1944, for example, the Western Mail reported that:
Anti-aircraft shells, one of which exploded in a crowded factory, killing 12 people, including seven women, and injuring as many more, were the chief cause of damage during activity over the South Wales coastal area on Monday night.