Not seen that photo, any idea on the newspapers that used it?
As for the passport thing, I wondered the same too as it seems a little convenient. However there are a number of reasons for carrying it.
1) they want to be identified after death
2) having a form of ID reduces the chances of extended police checks if they're stopped
3) if they decide to make a get away rather than carry out the attack due to obstacles (too much security for example)
4) 'false flag' - make it look like it was a refugee to further scare Europe
A video doing the rounds at the minute is this interview from Stacy Dooley for the BBC a few years back.
https://www.youtube.com/watch?v=f8WVkbXOHfM
They were protesting about the police arresting the wife of a suicide bomber.
Obviously they're in a minority, but there is definitely a cancer in the midst of the U.K.