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The Spanish Eye > News > Warning for homeowners in Spain: The MANY signs you’re being targeted by burglars or squatters
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Warning for homeowners in Spain: The MANY signs you’re being targeted by burglars or squatters

The Policia Nacional issued a warning this week

Last updated: February 10, 2026 9:13 am
Laurence Dollimore
Published: February 10, 2026
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Plastic wedged in door typically left by would-be burglars (Policia Nacional)

The Policia Nacional has warned homeowners in Spain to be aware of the signs that a burglary gang is targeting their home.

In a post on X, the force said members of such groups will leave signs on front doors to signal that a property is a target.

Among these signals is a small piece of plastic wedged between the lower part of the door and its frame.

Thieves will leave the plastic for a few days and come back. If it’s still there, it means no one has come or gone from the property, making it a target.

‘Careful! A small piece of plastic could be the signal a thief is looking for,’ the Policia Nacional said, ‘check your door and if you notice anything unusual call 091.’

It’s just one of the many signs that thieves may be targeting your property.

Plastic wedged in door typically left by would-be burglars (Policia Nacional)

Last year, a home security company issued a warning to all property owners in Spain.

According to Prosegur, burglars are marking people’s front doors with a variety of signals, indicating what type of target they are.

If you see any symbol etched into your door you are advised to call the police immediately, as it means you are likely being watched by thieves.

The symbols are typically very small and are made with chalk.

Prosegur’s key says an ‘X’ indicates that the owners are away on holiday, while an ‘X’ inside a circle means they are on vacation but will be back soon.

Meanwhile, an ‘M’ means the homes are vacant in the mornings, while a ‘W’ means they are empty at night.

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The chilling code suggests that robbery gangs are watching their targets for some time before deciding to strike (Credit: Prosegur)

A capital D that is underlined, meanwhile, means that the house or apartment is prime for burglarising on Sundays.

If you see a ‘7’ and ‘8’ next to each other, with each number in a circle, that means the property is free during the months of July and August.

A triangle indicates that the home has already been robbed, while a circle on its own warns of police nearby.

A series of other symbols warn of dogs, children in the home and whether or not the home is easy to rob – and even if the owner is disabled.

The chilling code suggests that robbery gangs are watching their targets for some time before deciding to strike.

In addition to drawings, thieves may leave other signs, such as faint threads of glue, adhesive strips, or pieces of plastic attached to doors to check whether the occupants have left the house.

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If you come home to find any of the above, don’t touch anything, don’t erase the marks (if they’re made with chalk or something similar), take photographs, and call the police immediately.

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ByLaurence Dollimore
Laurence Dollimore has been covering news in Spain for almost a decade. The London-born expat is NCTJ-trained and has a Gold Star Diploma in Multimedia Journalism from the prestigious News Associates. Laurence has reported from Spain for some of the UK's biggest titles, including MailOnline, The Telegraph, Daily Mail, Mail on Sunday, The Sun and the Sun Online. He also has a Master's Degree in International Relations from Queen Mary University London.
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