Australia has warned Israel it is "gravely concerned" about the use of Australian passports in an alleged assassination in Dubai and demanded full co-operation into an investigation into the incident.

The Foreign Affairs Minister, Stephen Smith, today said that preliminary analysis by Australian officials indicated the passports had been duplicated or altered. The passports were issued in 2003, before enhancements were made to Australian documents.

Do you know more? Email us with information or images.

Mr Smith called in the Israeli ambassador, Yuval Rotem, in Canberra this morning and demanded "full and transparent co-operation" from Israeli authorities.