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This chilling CCTV footage was recorded by a mum after she fitted a camera to find out what had caused scratches to her back door.

The video showing a would-be burglar has gone viral, clocking up almost 25,000 views since it was posted on Facebook by terrified mum-of-two Lisa Mackenzie.

The care home assistant from Bridgend in Wales said she was physically sick when she played back the recording and saw that someone had not only been in her garden but had tried to open the back door while she was asleep upstairs with her two children.

Even more chilling was the fact the prowler – believed to be a man – appears to have come prepared, hiding his identity with a large hooded anorak, carrying a torch, and wearing gloves, Wales Online reports.

Police are investigating and have increased patrols in the area around Lisa’s home in Brackla, Bridgend, following the attempted break-in at around 1.15am on Monday.

“I was sick. I was shaking uncontrollably after watching the video,” said Lisa, 30.

“It’s just the thought that somebody was there and what could have happened if he did get in, if I hadn’t locked the door.

“What winds me up is I work hard for what little I have and to think somebody is trying to take it.”

The £350 CCTV system was fitted just last week following another break-in attempt.

Just over a month ago Lisa had found scratches around the lock on her back door.

A wire, which she knew to be a wiper blade insert, had been left on the floor nearby. It had been bent into a hook shape at either end.

On Monday morning Lisa realised the back gate, which gives access to the back garden from the front driveway, had been left open.

She suspected one of her young children was responsible but thought she had better view the CCTV just in case.

The eerie video has left her unable to sleep. She has also spent hundreds of pounds on further security measures.

The intruder tried to pick the lock of this door and left this wire behind.

“I thought I was paranoid. But now I wish I was paranoid,” she said.

The one-and-a-half minute video shows the prowler walking calmly across the back patio, looking over the fence and up the driveway, before standing in front of the kitchen window and shining a torch inside.

Lisa believes he spots the CCTV warning sign in her kitchen window as he briefly looks up – possibly looking for the camera.

But he is undeterred and climbs the steps to the locked back door – which police told Lisa they think he tried to open – and then leaves, trying to close the gate behind him.

“I am not hopeful of catching him but I want to make people aware that there are people out there doing this,” said Lisa.

She added she had been overwhelmed with messages of support from the community since she posted the video on Facebook.

South Wales Police Inspector Richard Weber said: “We understand the footage causes concern but would like to reassure residents that burglary levels are low in the area and it appears to be an isolated incident.

“We know that burglars will check many properties for unsecured doors and windows and unfortunately they find them all too often. People should always ensure their houses are secure.

“In this case the property was secure and that, together with CCTV cameras, may well have deterred the individual – the footage may hopefully assist our investigation too.”

Anyone with information can contact police on 101 or Crimestoppers on 0800 555111.