Police in Douglas are investigating three incidents of arson.
They happened in the public toilets on the promenade, on Wednesday evening.
Officers say that fortunately the fires didn't take hold and no one was injured.
However, there were a number of people on the promenade at the time and somebody could have seen the fires being lit.
Anyone who has information is asked to ring Police Headquarters on 631212, or the anonymous Crimestoppers number, which is 0800 555 111.
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