GREENWICH police say they have received reports of arson after a spate of grass fires on Plumstead Common.
There were five minor fires on the common over the weekend including a tree alight at midnight on July 21, and flames during merrymaking at festival Plumstead Live.
There are reports that at least one fire was deliberately started by a small group of young people.
It comes after fire crews were called to three different fires on Plumstead Common in just over an hour on July 16.
A Greenwich Police spokeswoman said: “We can confirm that the London fire Brigade have notified us of a number of fires across Plumstead Common.
“We have received allegations that at least one of three fires has been deliberately started by a small group of young people.”
Anyone with information is asked to contact Sergeant Kevin Hebdon, of Plumstead Safer Neighbourhood policing team, on 020 8721 2639.
In case of an emergency dial 999.
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