Drone footage captured a raging inferno at an industrial estate in Dartford. The footage shows a building engulfed in flames with fumes of thick black smoke disappearing into the sky. Firefighters can also be seen frantically hosing the building from its side in an attempt to distinguish the fire. Around 12 small firms including welders and a party business supplier are based at the complex. It is believed the fire was caused by a gas cylinder in a motorhome parked on site. At its height, ten fire engines were sent to the estate off Birchwood Road in Joydens Wood yesterday (08/08) to tackle the blaze. An eyewitness said: "I could see the clouds of smoke from my house - the fire was enormous. "I went out cycling for two hours and when I got back it was still burning away. "Thankfully it doesn't sound like anyone was hurt."