Detectives say an arsonist who started a van fire may have set themselves on fire.
A Ford Transit van was set alight deliberately in Cwm-y-Glo, near Caernarfon, at around 7.10pm on Sunday evening (2nd December).
The suspect was seen leaving the area on foot, but may have injured themselves after their clothing caught fire.
Police are keen to speak to a couple who were walking their dog at the time of the arson attack and may have seen the incident unfold.
Anyone with information should contact PC Jamie Atkinson on 101, quoting reference no. 18400053608, or Crimestoppers anonymously on 0800 555 111. Alternatively, contact the North Wales Police control room via the live web chat.