Labour leader Jeremy Corbyn has said that it would have been "far better" if Mohammed Emwazi, the British Isis executioner known as 'Jihadi John', had been tried in court.
Mr Corbyn's full statement was as follows:
We await identification of the person targeted in last night’s US air attack in Syria. It appears Mohammed Emwazi has been held to account for his callous and brutal crimes.
However, it would have been far better for us all if he had been held to account in a court of law.
These events only underline the necessity of accelerating international efforts, under the auspices of the UN, to bring an end to the Syrian conflict as part of a comprehensive regional settlement.
Emwazi rose to notoriety in August 2014 when Isis released a video of him beheading journalist James Foley.
He appeared in subsequent videos which showed the murder of American journalist Steven Sotloff, British aid worker David Haines, UK volunteer Alan Henning, US aid worker Abdul-Rahman Kassig and Japanese journalist Kenji Goto.
In February, David Haines' widow, Dragana, called for Emwazi to be captured alive.
She told the BBC:
That's the only moral satisfaction for the families of all the people that he murdered, because if he gets killed in the action, to put it that way, it will be an honourable death for him and that is the last thing I would actually want for someone like him.
Prime minister David Cameron has said "we cannot yet be certain that the strike against Jihadi John" was successful, in a statement outside Downing Street on Friday.
This was an act of self defence. It was the right thing to do.
Britain and our allies will not rest until we have defeated this evil terrorist death cult, and the poisonous ideology on which it feeds.