Ms Mellhi, who is from Cheltenham, said on Twitter: "To person who dropped two bags of pork scratchings into my basket in Sainsbury's: your pitiful Saturday activity backfired. I'm not Muslim."

She later said the "bizarre" incident had offended her and added: "It shocked me a bit.

"I think it was deliberate, though I couldn't say 100 per cent, but nothing about it was a normal situation.

"Did people want to offend me? I don't know. Did they think it was funny? Probably.

"Had I been a Muslim or had it happened to a Muslim then I would have found it more offensive than I did.