united-states property
Tiki torch along property line
<p>If I have a tiki torch placed vertically on my property next to the pole there on my neighbor's property, and it catches fire, am I legally responsible?</p>
<p><a href="https://i.stack.imgur.com/VPMaY.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/VPMaY.jpg" alt="enter image description here" /></a></p>

<p>It may depend on the jurisdiction (although I  can't readily think of one where this is not the case) but deliberately, recklessly or negligently putting a burning object next to someone else's property knowing that there is a real risk of it catching fire (and going ahead with it anyway) will almost definitely make one liable: especially if there is an <a href="https://law.stackexchange.com/questions/71052/problem-with-neighbors">ulterior motive</a>.</p>
<p>In <a href="/questions/tagged/england-and-wales" class="post-tag" title="show questions tagged &#39;england-and-wales&#39;" rel="tag">england-and-wales</a> This would be called arson - causing criminal damage by fire - an offence contrary to <a href="https://www.legislation.gov.uk/ukpga/1971/48/section/1?timeline=false" rel="noreferrer">section 1(3) of the Criminal Damage Act 1971</a></p>
<p><sub>Cross posted with the jurisdiction defining comment</sub></p>
