Charlie Heaton, pictured, was flying to Los Angeles for the season two launch party when he is said to have been caught with the substance by sniffer dogs

Stranger Things star Charlie Heaton has allegedly been denied entry to the US after being caught with cocaine at the airport.

The British actor was flying to Los Angeles for the season two launch party when he is said to have been caught with the substance by sniffer dogs.

US border officials denied the 23-year-old entry to the country last Saturday and deported him back to London where he had flown from just hours before, The Sun reports.

It meant that he was missing from the glitzy premiere of the Netflix-produced supernatural show on Thursday evening.

It is also now feared that Heaton could be barred from entering the US in future meaning he could struggle to take part in filming for Stranger Things.

A source claimed: 'He was not arrested. He was held at the airport for a while and then put back on a plane to London that night.

'If you are a foreign national and it is a large amount of drugs you may be charged.

'But if it is personal use, the consequences are that you will not be allowed in to the country. US law is very strict on this.' MailOnline has contacted representatives for Heaton.

Yorkshire-born Heaton, who has previously starred in DCI Banks and Casualty, plays Jonathan Byers in the sci-fi show

Heaton was missing from the glitzy premiere of the Netflix-produced supernatural show on Thursday evening

Yorkshire-born Heaton, who has previously starred in DCI Banks and Casualty, plays Jonathan Byers in the sci-fi show.

The new series, which debuts today, takes place a year after the first,leading to some major character developments.

'They start out a year later, and they're totally sort of new people as a result of this experience that happened last year,' said David Harbour, who plays Jim Hopper.

US border officials denied the 23-year-old entry to the country last Saturday and deported him back to London where he had flown from just hours before, The Sun reports

Earlier this month the actor was pictured walking hand-in-hand with Stranger Things co-star Natalia Dyer in New York City.

It had been rumoured for months that the pair were dating - with the two seeming to confirm the suggestions during their casual walk.

They were first linked at the start of the year after being seen jetting out of the airport together a number of times.

Since then they have appeared together at May's MTV Movie & TV Awards while also looking chummy at August's San Diego Comic Con.