The Ministry of Defence has apologised after it emerged body parts and tissue thought to be from 30 soldiers killed in Iraq and Afghanistan were kept without permission from their families.
The MoD said it would confirm their identities on Thursday and would write to families offering a formal apology and details of the material held.
"A small number of cases" did not follow procedure, the MoD said.
Maj Gen James Everard said two families had already been informed.
He said one of the samples dated back to 2002.
More top news
A number of teenagers, aged 13 to 15, from Portsmouth, have been treated in hospital, after taking tablets believed to be diazepam.
Thursday Evening's Pollen Forecast
Thursday night's weather for the east of the region