Concerned Celebrity Big Brother producers have called in police over threats made to Lee Ryan via Twitter trolls.

The Blue singer has received a string of abuse online in the wake of his bed-hopping antics in the house – with some users threatening violence against him.

One message told him: “You say you like damaged girls – I’m going to damage you when you come out of the house #stabyou #damage.”

Another added: “I’ll be waiting on the outside for you. #stabyou.”

A source told the Daily Star Sunday: “The threats are too serious to ignore. It’s terrifying to think people are prepared to go that far.

“Lee was expecting some viewers not to like him but it is getting too extreme. He’s not perfect but he doesn’t deserve threats like this.

The source added: “Threats of stabbing are incredibly worrying for everyone who works with Lee and for his friends and family.

“His team wanted to flag it up with police so it can be dealt with appropriately.”

As a result of the threats security will be tightened at the Elstree studios on eviction nights.

Lee returned to the house with Casey Batchelor on Friday night after being secretly evicted into the Big Brother bolthole – with the pair subsequently choosing to evict Evander Holyfield from the house.