So, Exactly What IS Verifiable?

BBC's Johnston 'in good health'

BBC correspondent Alan Johnston, abducted in Gaza on 12 March, is in good health, Palestinian Deputy Prime Minister Azzam al-Ahmad has said. Mr Ahmad met the UK's consul-general to Jerusalem, Richard Makepeace, in Ramallah to discuss the efforts being made to secure Mr Johnston's release.

Mr Ahmad's office said in a statement: "The information that we have indicates that Johnston is in good health.

"The [Palestinian] government is fully co-ordinating with the presidency and all security services to pursue the extensive efforts to release Johnston and bring him back safely to his home, family and his work."

A previously unknown militant group said more than a week ago that it had killed the correspondent, but the BBC and Palestinian officials have said they have been unable to verify the claim.

Can't figure this out. What is and what is not and what cannot be verified in this story?