Batsh's expertise in making weapons could have made him a target - militants in Hamas-ruled Gaza regularly fire rockets at southern Israel, usually without causing casualties.
National police chief Mohamad Fuzi Harun said Wednesday that investigators found a motorcycle abandoned near the murder scene and were able to trace an actual photo of one of the suspects.
We believe that the suspect has been using different or fake identities since the day he entered the country or while he stayed here.
Two motorcyclists fired ten rounds at al-Batsh during the early hours of Saturday morning as he was on his way to a nearby mosque for dawn prayers. Fadi al-Batsh in Malaysia on Saturday, alleging that Israeli agents were systematically assassinating Arab scientists.
An image shows a suspect of killing of a Palestinian member of Hamas released by Royal Malaysia Police during a press conference at police headquarter in Kuala Lumpur, Malaysia, April 25, 2018.
Malaysian Deputy Prime Minister and Home Minister Ahmad Zahid Hamidi earlier said: "the government was always monitoring foreign agents, but this was sometimes made hard when they use passports which have diplomatic relations with Malaysia".
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Hamas leader Ismail Haniyeh said Mossad had been behind past attempts to kill Palestinian scientists, and the attack on Mr Batsh "follows this sequence".
He urged anyone who might have information to come forward, but acknowledged police were not sure if the gunmen were still in the country.
Al-Batsh, an electrical engineering lecturer at a Malaysian university, was believed to have been working on Hamas' unmanned aerial vehicle program and was working on improving the accuracy of its rockets.
A hail of bullets rang out moments later, killing the Palestinian on the spot.
But Israeli Defense Minister Avigdor Lieberman Sunday denied claims of the Jewish state's involvement, suggesting instead that it was a "settling of accounts" between factions of a terror group. Maybe in two to three days.
A string of Israeli officials have neither confirmed nor denied whether Israel had a hand in the killing.