Arson attacks account for more than a third of fires in Cumbria, according to new figures.
During 2015 and 2016, 38 percent of fires in the county were started deliberately.
In Allerdale there was a 20 percent increase in the number of arson incidents.
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Some social media users have called for the cow to be freed and are using the hashtag #SaveCarlisleCow.
A man and a woman, both in their 30s, were left with serious injuries and were taken to the Cumberland Infirmary.
The bridge closed for the second time one week ago after divers found fresh damage to the crossing's foundations.