But in the statement, it said the panel worked "within the adoption legislation which includes ensuring that statutory and personal references are undertaken, alongside criminal record bureau checks and medicals".

BBC: Council's adoption process slow and "humiliating"

"The attack will not go unpunished, as we are committed to catching those responsible, " said a statement from the government of Guerrero state which includes Acapulco.

BBC: Mexico hunts Acapulco Spanish tourist rape gang

"The need for local negotiations could be significantly reduced if the NHS Staff Council, which includes the RCN, were to bring national negotiations to a swift and successful conclusion, " it said in a statement.

BBC: Nurses leaders warn regional pay plan would harm care