VIENNA: Austrian police have launched an investigation after small metal objects such as nails, needles and pins were found in Halloween sweets at several locations across the country.

German authorities this week also reported several cases of small metal objects being found inside Halloween sweets.

Austrian police have received 13 reports of metal objects found in sweets collected by children at Halloween, federal criminal police said on Wednesday in a statement sent to AFP.

Although no reported cases have required medical treatment, police urged parents and children to "carefully check... all Halloween sweets before they are eaten."