The two men suspected of gunning down Hamas engineer Fadi al-Batsh in Kuala Lumpur were still in the country, Malaysian police said on Wednesday, as they released a fresh image of one of the men, reports said.
Hamas has accused Israel of the assassination.
Two men on a high-powered motorcycle fired at least 14 shots at Batsh, an engineering lecturer, outside his apartment building on Saturday, killing him on the spot.
A Kawasaki motorcycle was found abandoned near a lake about nine minutes from the scene, from which police were able to trace a photo of one of the suspects, Inspector-General of Police Mohamad Fuzi Harun told reporters.
The suspects were believed to have entered Malaysia sometime in late January, but it was not known what nationalities they were or where they had traveled from, said Mohamad Fuzi.