Arsonists posted a firework through a letterbox to a house in Oxford.
Police are appealing for witnesses after attack in Crescent Road, in Cowley, at 11.15pm on Saturday.
Pc Andrew Reid said: “Fortunately nobody was injured as a result of the incident thanks to them having a smoke alarm fitted.
“I appeal to anyone who was in this area of Cowley on Saturday evening and saw anybody acting suspiciously to contact police immediately.”
Anyone with information should contact police on 08458 505505 or Crimestoppers on 0800 555111.
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