A police investigation has been launched in to the alleged leak of emails from the former UK ambassador in the US.
Sir Kim Darroch called the administration of US President Donald Trump "clumsy and inept" in the emails.
It led to him stepping down from his post earlier this week.
Trump had said the US would no longer deal with Darroch and called him a "a very stupid guy."
The newly announced criminal investigation will try and find out who was behind the leak.

US and Iran having 'very good discussions', Trump says
Projectile sinks Indian ship near Yemeni waters; all seafarers safe
Russia kills 17 in heavy ballistic hit on Ukraine, destroys warehouses, logistics
Plane tyre bursts on landing at Cape Town airport, disrupting flights
Status of US-Iran talks uncertain as ship struck in Hormuz