Electors returning from abroad have been advised to produce their Passports in addition to their National Identity Cards (NIC) when they come to cast their vote, a statement from the Election Commission said.Chairman Elections Commission, Mahinda Deshapriya said in a statement that such instructions were being issued so as to prevent voter rigging."Any such elector who fails to produce the passport even though he/she produces any other valid identity document will have to make a declaration on the specimen as required by the Presidential Elections Act," the statement said.Further, the statement added that a ballot will not be issued to the elector who declines to make such a declaration. In addition, action will be taken to handover any such elector whose identity is suspicious to the Police treating him/her as attempting to commit vote-rigging.