Police in Highbridge say four bottles of flammable liquid were thrown over a hedge in a suspected arson attack.
It happened on Thursday last week, August 2, during the early hours of the morning at a building site in Newton Road.
A spokesman for Avon and Somerset Police said: "The suspect was chased towards Apex Park but he then disappeared from sight in a nearby housing estate.
"A man in his 20s was later arrested on suspicion of arson with intent.
"We are appealing for anyone who may have been in the area at the time of the incident who may have information to help out enquiries.
"We would particularly like the person who had previously contacted us with information which helped us arrest the suspect to contact us.
"Anyone able to help is asked to contact us quoting reference 521817237."