Health warnings after toxic caterpillar outbreak in London.
Oak processionary moths (OPM), which are in their larval stage, have been spotted across the south-east of England and in the capital.
Hairs on the caterpillars can cause fevers and eye and throat irritations, the Forestry Commission said.
The organisation has issued a caution not to touch the species.
The biggest infestations of OPM were recorded in Greater London, stemming from Kingston upon Thames to Brent.
It is thought that the moths were brought into the UK on trees imported from Europe for a landscape project.
