A mother who claims she found broken glass in her children's breakfast cereal is furious after being offered £9 in vouchers.

Reina Campbell, of West Way, Lancing, says she discovered a piece of glass the size of a two pence piece in Kellogg's Frosties after pouring it into bowls for her children.

She said: "My three-year-old daughter Hannah picked it up on her spoon and asked me what it was. I had a look and saw it was glass and I just could not believe it. Luckily, it did not go in her mouth or cut her but it easily could have done."

Mrs Campbell took the Frosties and the glass to the supermarket where she bought them, where staff said they would forward them to Kellogg's headquarters to be investigated.

Almost three weeks later Mrs Campbell received a letter from Kellogg's telling her the company had no idea how the glass had got into the packet and offering her £9 worth of vouchers as a "gesture of goodwill".

She said: "They told me it hadn't got into the packet at their factory and they didn't know how it got there. But if it didn't get in at the factory then someone must have put it there, because the whole packet was sealed when I got it from the supermarket.

"Their response is not acceptable. What would I want with £9 worth of breakfast cereal? I only bought the Frosties this time as a one-off because my son Josh wanted the stickers which came with them.

"At the end of the day the glass must have got in there somehow and it was lucky my daughter wasn't badly hurt. The vouchers are not enough to make up for something like this."

John Mandy, Kellogg's UK consumer services manager, said the company had taken Mrs Campbell's complaint very seriously and carried out a thorough investigation.

He said: "We have analysed the glass and checked the incident books and quality control documents for the particular batch of Frosties.

"We concluded there was no way the glass could have come from the manufacturing or distribution processes at Kellogg's.

"Following that original investigation we wrote to Mrs Campbell and informed her of our findings. As a gesture of goodwill we also sent her £9 worth of Kellogg's vouchers to compensate her for any inconvenience.

"Although we have concluded that the glass Mrs Campbell found did not come from the factory process we would be happy to send the sample away for further analysis in an attempt to discover where it did come from.

"We will share this information with Mrs Campbell as soon as we have the results."