There are some British hostages that are now known to be safe, but I am told that up to 20 are still to be identified - some may still be missing, some could still be hiding, others could be injured and not be properly identified, but sadly, too, there may be others who are dead.

BBC: David Cameron's deep anxiety over Algeria

Some critics may feel we may be missing some things.

FORBES: It's Time to Abolish Bosses

But he conceded some of them may be missing.

CNN: Report: Pentagon lost almost 200,000 weapons in Iraq