The 40-year-old country star was slammed by fans on social media on Saturday (13Aug16) after a series of tweets were stumbled upon by fans, British newspaper the Daily Mirror reports.

Following his first number one album in the U.S. back in 2011, Shelton appeared to insinuate a man speaking a foreign language was a terrorist.

He allegedly wrote in a now-deleted tweet, "Wish the d**khead in the next room would either shut up or learn some English so I would at least know what he's planning to bomb!!"

Back in 2010, The Voice judge allegedly revealed he had a crush on actress Dakota Fanning, who was then only 16. "Soo (sic)... I just figured out a great excuse for my sick fantasy about Dakota Fanning. I thought she was Amanda Seyfried," he wrote.

The country singer, who is now dating former The Voice judge Gwen Stefani, was criticised by his fans for his offensive tweets, which have now been removed from the social media site.

"Absolutely zero people should be surprised that Blake Shelton, a country singer from Oklahoma, is racist and possible homophobic," wrote one Twitter user.

Another tweeted, "@blakeshelton I can't believe you would say something so racist I will never buy your music again."

Despite being removed from Twitter, screenshots of the offensive posts are circulating online.

A representative for Shelton has yet to comment on the report.