Police arrested a man on Saturday on suspicion of starting a fire at a Covid-19 testing station Tai Wai.
Officers said they they received a report about the suspected arson at a testing point outside San Fong House in Sun Chui Estate at around 4.45pm.
They added that a suspect was subdued at the scene and firefighters had put out the blaze.
No one was injured.
A video posted online showed that some rubbish in an overturned wheeled bin was on fire and a man appeared to have been subdued by workers in protective gear next to it.