How Four Burglars Emptied Ten Houses with a Simple Trick — and What It Means for Mallorca

How four burglars emptied ten houses with a simple trick — and what it means for Mallorca

Key question: How could perpetrators open houses for months without leaving visible traces — and what really needs to change?

Between March and August 2025 a gang in Mallorca searched at least ten houses, stole jewelry and cash and left hardly any visible signs of forced entry. The four suspects — one Spaniard and three Colombians — have meanwhile each accepted two years in prison and deposited €50,000 as compensation. The National Police brought the group down. The surprising thing: the perpetrators worked with a classic but underestimated method called "impressioning" and with social deception — posing as technicians or parcel couriers.

What is impressioning? Broadly speaking, one makes a key from a blank by inserting the blank into the lock multiple times, turning it and then refining the impressions that form. The result: a functional key without break-in marks on the cylinder. In practice a short trial, a bit of patience — and a lock that is not protected against this method — are enough. That explains why the perpetrators apparently entered without visible signs of force.

Critical analysis: three factors collide here. First: many households still have simple cylinder locks that are vulnerable to impressioning. Second: the perpetrators relied on social manipulation; people are more likely to open the door for someone who appears to be a worker or a delivery person. Third: the organization worked — safe hiding places in Palma, division of roles (searchers, renters of vehicles, transporters), occasional trips to and from the mainland — which increases professionalism and reduces the error rate.

What is often missing in the public debate: the discussion focuses on the arrests and the penalties. Hardly anyone asks which practical weaknesses in everyday infrastructure were exploited. It's not just about "more police," but about preventive measures, minimum technical standards and simple behavioral rules that could significantly reduce the risk.

A scene from everyday life: on a quiet morning along Passeig Mallorca an older man sweeps the sidewalks, vans pass by, a bicycle courier brakes. Many people receive parcels at the front door; some leave unlocked balcony doors open when they step out briefly. In such moments a convincing appearance — work jacket, clipboard, friendly voice — is enough and the door opens. The sound of a caster wheel or the rustle of a uniform generates trust; that is the security gap.

Concrete solutions: homeowners can act quickly. Replacing simple cylinders with certified lock cylinders that offer protection against impressioning is effective. An additional lock (chain, bolt, security bar) makes rapid access more difficult. Visible deterrents help: well-placed cameras, alarm stickers, neighborhood apps, parcel lockers for deliveries. Behavioral tips: have deliveries sent only to secure drop-off points or parcel boxes, verify the identity of strangers, inform neighbors if you will be away.

At the institutional level coordinated steps are needed: targeted information campaigns by police authorities about this specific attack method; cooperation with locksmith businesses to offer subsidy programs or discounted replacement campaigns for vulnerable groups (elderly, people living alone); preventive checks for short-term rentals and for unusually frequent vehicle rentals in certain neighborhoods; better recording and monitoring of tool and spare-part sales that can be used for impressioning, without resorting to disproportionate interventions.

Another point: neighborhood vigilance. Mallorca has many neighborhoods with close-knit communities — these social networks are a practical early-warning system. More small initiatives, less show: knowing your neighbors and asking them to keep an eye and ear out when you are away measurably reduces risk.

Conclusion: The convicted perpetrators did not use a Hollywood method but a banal technical weakness combined with everyday trust. That is uncomfortable because it does not reveal a single big problem but many small gaps — locks, delivery habits, information deficits. Living in Mallorca should be a wake-up call: these gaps can be plugged with manageable means. Authorities, craftsmen and neighborhoods must tackle the issue together before the method reappears.

Quick tip at the end: If you have doubts about your lock, ask a local locksmith instead of relying only on online recommendations. A sturdy cylinder and a simple additional lock often cost less than a single burglary loss.