Arson attacks on Warwickshire homes have become more common since last year, figures from the Home Office show.
In the 12 months to September 2017, the most recent data available, Warwickshire Fire and Rescue Service attended 18 deliberately started house fires, 20 per cent more than the previous year. In total, they attended 156 house fires.
Since 2013, two people have been killed in arson attacks.
In total, 13 people lost their lives in incidents attended by fire services over the last five years.
In the last year alone, eight died, the highest recorded level for five years. There were also 34 casualties, including 22 people who were taken to hospital as a result of their injuries.
Dave Green, national officer at the Fire Brigades Union, said: "Starting fires deliberately in the home is a heinous crime. Rightfully, it is a serious criminal offence punishable by law.
"Arsonists do not just put the immediate victims at risk; they put whole communities and firefighters themselves in jeopardy.
"The fire and rescue service is already stretched to the limit in the fire cover they can provide. If firefighters are dealing with an arson at the same time as another fire call comes in, then those other victims are looking at a long wait before we can get to them."
Across England, 346 people lost their lives in fires between October 2016 and September 2017, including 47 in deliberately started fires.
The Grenfell Tower fire in Kensington in June 2017, which claimed 71 lives, meant the figure was the highest for any 12-month period since the data was first recorded in 2009.
There were more than 30,000 house fires across the country over the year, over 3,000 of which were started deliberately.