Christmas shoppers are being warned to be careful and not fall victim to buying fake presents sold by criminals.

Border Force, the government's law enforcement agency which carries out immigration and customs controls, said counterfeit products have potential health and safety risks, as they have not been subject to the vital testing of those sold by honest retailers.

Millions of goods like Premier League football jerseys and the latest children's toys are seized each year, the majority of which are bought online and shipped in from abroad.

Using counterfeit websites could compromise personal banking details, and Border Force warns that proceeds are linked to supporting sweatshops, child labour and even terrorism.

Once items are seized, Border Force's specialist international trade teams work with the owners of big brands to establish if goods are genuine.

If they are fake, the goods are destroyed and the rights holders can then decide whether to take out a private prosecution.

Border Force has issued advice on how to avoid counterfeit goods, which are shipped in every week in a bid to rip off brands and consumers.

- Is the price right? If the price is too good to be true, then it probably is

- Do the tags match? If you have a smartphone, use a scanner app to see if the barcode is real

- Is it the total package? Is the spelling correct, does the logo look right, and is it up to the standard a top company would offer?

- Does it pass the sniff test? If it doesn't smell right, it might be a fake. For example, counterfeit perfume often has a different scent, and fake footwear could have a strong smell of solvents due to cheap glue.

Consumers who believe they have purchased counterfeit goods are advised to contact Action Fraud, their local Trading Standards office or visit the Citizens Advice website.

Immigration minister Caroline Nokes said: "Counterfeit goods, especially electronics and beauty products, can risk the safety of consumers, and allow organised criminals to take money from honest retailers and public funds.

"Border Force are at ports, airports, and mailing rooms, working hard to keep these knock-off goods out of the country, depriving criminals of illicit profits and keeping consumers safe.

"I would also urge the public to take precautions so that these products don't end up under their Christmas tree."