Malaysian police say they are looking for four more North Korean suspects in connection with the murder of Kim Jong-nam. The men are said to have left Malaysia last Monday, the day the half-brother of North Korean leader Kim Jong-un was killed at Kuala Lumpur airport. <br/><br/>Four other people have already been detained. Police believe poison was sprayed into Mr Kim's face as he waited to board a flight to Macau. Deputy national police chief Noor Rashid Ismail identified the North Korean suspects at a news conference today. <br/><br/>The four already in custody include an Indonesian woman, a Malaysian man, a woman with a Vietnamese passport and a North Korean. The Indonesian national, named as Siti Aisyah, is said to have told Malaysian police she had been paid to perform what she thought was a prank.