It also may not have been the first time Israel carried out such an attack outside its territory, with analysts pointing to the killing of a Hamas-affiliated scientist Muhammad al-Zawari in Tunisia in 2016.
Malaysian police appealed for public help Monday as they released images of two suspects in the killing of a Palestinian engineer in Kuala Lumpur.
National police chief Mohamad Fuzi Harun said that the motorbike allegedly used by the assailants had been found in the Setapak area of Kuala Lumpur.
Malaysian police had earlier released computer-generated images of the two suspects, who witnesses described as well-built and light-skinned, possibly Middle Eastern or European.
"We believe that the suspects are still in the country", Fuzi said, adding that they may have changed their appearance.
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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.
Family and friends of the 35-year-old, along with Hamas, have accused Israel's Mossad spy agency of carrying out the killing, but Israel has denied the claim.
Al-Batsh's body was released to his family on Wednesday and taken to a surau, or Islamic assembly building, where dozens of people mourned his death at a funeral ceremony.
He urged anyone who might have information to come forward, but acknowledged police were not sure if the gunmen were still in the country.
Mr Batsh was a lecturer at Universiti Kuala Lumpur, specialising in power engineering, according to the university.
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Deputy Prime Minister Ahmad Zahid Hamidi said on Saturday the suspects were believed to be Europeans with links to a foreign intelligence agency.
Israel's defence minister Avigdor Lieberman had appealed to Egypt to refuse the Palestinian request.
"The viral video stems from sharing on Facebook, where the owner later admitted that he had erred in translating the allegations of the Arab man regarding the number of calls made to the police which should actually be two to three calls", he told a press conference at the Kuala Lumpur Police Contingent Headquarters, here. In addition, he charged that Israel was behind the fatal shooting of a Hamas drone expert in Malaysia.
A string of Israeli officials have neither confirmed nor denied whether Israel had a hand in the killing.
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