A wildfire in Twmbarlwm was set deliberately, Gwent Police have confirmed.
Firefighters were first called to the site near Risca just after midday on Saturday 14th July.
As of midday on Friday, eight fire engines and a helicopter were tackling the blaze.
- Watch the report from Mike Griffiths below:
Matt Jones from South Wales Fire and Rescue Service said the situation is “challenging” and crews are doing their best to keep the community safe.
Firefighters said the fire has been worsened by the hot weather. The ground is so dry, it is soaking up the water being used to put out the fire. Windy conditions mean the fire is spreading faster.
South Wales Fire and Rescue Service has asked the public to stay away from the area and warned against the use of any open flames or barbecues.
A number of grass fires have been burning in other places across Wales.
Firefighters have been tackling a wildfire in Llantysilio, Denbighshire which started on Thursday afternoon. Around 800 square metres of land have been affected.
Fire crews were also called to a grass fire in Pentrebach, Merthyr Tydfil around 10am on Friday.
There have been reports of further grass fires in Troedyrhiw, Llangorse and Trallwyn.