An aggravated burglary in Greenford has been linked to a series of similar incidents across West and Nort-West London by police. 

In each incident, a group of masked men forced entry into the house and either threatened or sprayed residents with a corrosive substance before fleeing. 

The other incidents have occurred in Highfield Avenue, NW11; Flamsted Avenue, Harrow; Lady Margaret Road, Southall; Harrowdene Road, Harrow; and Greenford Road, UB6. 

Detective Sergeant Huss Ahmed, North West Command Unit, said: "Local people have been rightly concerned following a number of incidents that have been reported online and on social media. We of course share that concern. 

"We can confirm we are treating five incidents across Harrow and Ealing as linked. 

"We are advising local people to be vigilant but not alarmed - stay alert to your surroundings at night, keep doors locked and windows closed, and monitor any doorbell and security camera systems to check on any suspicious activity. 

"If you have information, video or images that you think could help us, it is vital that you report it to us immediately so that we can track down and arrest the people responsible." 

There have not yet been any arrests, but if you have any information then contact the police by calling 101 or tweeting @MetCC with information, ref CAD8586/30Mar or to remain anonymous contact the independent charity Crimestoppers on 0800 555 111. 

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In the other incidents, at approximately 11.14pm on Wednesday 29th March at Highfield Avenue, there were reports of an aggravated burglary in which four men forced entry and threatened the resident with a knife before throwing an unknown substance towards the victim, who is a woman in her 40s. 

At around 11.40pm on the same date at Flamsted Avenue, four males forced entry and stole a quantity of jewellery. 

Then at around 10.56pm on Thursday 30th March there were reports of an aggravated burglary at Lady Margaret Road, four men broke in with a knife and a screwdriver, sprayed a corrosive liquid on the face of the resident and stole a safe containing money and jewellery. 

On Friday 31st March at around 8.45pm, four males forced entry into a property at Harrowdene Road, threatened the use of a liquid before stealing jewellery and other items. 

The final incident happened at 9.09pm on the same day on Greenford Road, when a group of men reportedly forced entry, the three female occupants, one in her 60s and two in their 20s, were assaulted with a corrosive substance.