Spanish investigators are probing an alleged attack on the North Korean embassy in Madrid.
On 22 February, a group of 10 assailants reportedly broke into the building, tying up, beating and interrogating eight people inside.
The incident took place just days before a key summit between US President Donald Trump and North Korean leader Kim Jong-un.
And now there are reports US intelligence services were involved.
With the US and North Korea striving to improve relations after nearly 70 years of hostility, such allegations could be explosive.
The BBC contacted police in Madrid for comment, but has yet to receive a response.
So what exactly happened at the embassy?