Suspected sabotage at ­Allied Bakeries' manufacturing site in Orpington, Kent, has resurfaced nine months after it appeared to have ended.

Incidents of alleged tampering have dogged the site since last summer, with sewing ­needles, glass and chewing gum found in packs of Kingsmill bread.

To date there have been 35 reported contaminations, but the last was reported in January.

A spokesman for the Metropolitan Police said three further incidents were reported last week - two involving glass and one involving a needle. No arrests had been made and inquiries were continuing.

A bakery spokeswoman said: "Allied Bakeries is working with the Food Standards Agency and the Metropolitan Police. We continue to take all necessary action to ensure our products are safe."