Passports belonging to the alleged killers of a top Hamas official in Dubai are fraudulent, the British and Irish governments have said.
Ireland said the names and passport numbers of three suspects did not match anything issued by its officials.
Britain said it believed the six British passports were also fraudulent.
Arrest warrants were issued for the suspects named by police in Dubai, where Mahmoud al-Mabhouh was murdered in a hotel room on 20 January.
Two more men, one using a French passport and one using a German passport, are also suspected of playing parts in the assassination.
The French foreign ministry said it was "not able to confirm the nationality of this person", according to AFP news agency.
German officials said the passport number was either incomplete or wrong, Associated Press reported.
Reports have suggested that Mr Mabhouh was in Dubai to buy weapons for Palestinian Islamist movement Hamas.
I don't know how this happened or who chose my name or why, but hopefully we'll find out soon
Hamas have accused Israeli agents of killing him.
http://news.bbc.co.uk/2/hi/middle_east/8518481.stmPhotos at link