London, Oct. 16 (Reuters): The background in the new series of US TV hit Homeland is supposed to look like a Syrian refugee camp, but one of the graffiti slogans that CIA agent Carrie Mathison, played by actress Claire Daines, walks past declares in Arabic: "Homeland is racist".

Other scenes in the show, which aired in the US this week, had walls covered with similarly pointed Arabic messages: "There is no Homeland, Homeland is not a show."

The graffiti were planted on the set of the show, which was filmed in Berlin this summer, by a German-based trio who call themselves the "Arabian Street Artists".

Hired to make an area on the outskirts of Berlin look like a refugee camp in Lebanon, they took the opportunity to make a statement about the show's depiction of US intelligence efforts to thwart terrorist plots.

After the show was aired on the Showtime network in the US on Sunday, and their subterfuge passed undetected, the artists made public what they had done.

"The series has garnered the reputation of being the most bigoted show on television for its inaccurate, undifferentiated and highly biased depiction of Arabs, Pakistanis, and Afghanistan, as well as its gross misrepresentations of the cities of Beirut, Islamabad - and the so-called Muslim world in general," the artists, Heba Amin, Caram Kapp and one who uses only the name Stone, said in a post on Amin's website.

Alex Gansa, co-creator of Homeland, said: "We wish we'd caught these images before they made it to air."