"As far as I know it's not possible for a state to issue a guarantee like that in advance. I want to emphasize that an extradition request has not even been made by the United States," Alhem says.
However, it would have been possible for Swedish prosecuters to conduct an interrogation in the United Kingdom.
"The prosecutor could have asked the British authorities to allow an interrogation to take place in London before a decision was made to issue a European order for his arrest. Instead the prosecutor decided to issue the arrest order, which is also correct. But in hindsight one wonders if it wouldn't have been wiser to conduct the interrogation first," Alhem says.