Two explosions and shooting have been heard at a US military base in the Afghan city of Jalalabad, according to a Reuters witness.
The Taliban said they carried out an attack on the compound and inflicted casualties. NATO officials were not immediately available for comment.
More top news
The PHE will review the evidence and also make recommendations on how to address the issue, according to health officials.
The Commons Public Accounts Committee (PAC) said at least £9 million has been squandered on a project that failed to deliver.
A top temperature of 11 Celsius (52 F).