The family of Palestinian professor Fadi Mohammad al-Batsh, a member of the Islamist militant group Hamas, who is said to be an expert in rocket-making, has accused Israeli spy agency Mossad of carrying out the assassination. Israel denied the claims.
Police in Malaysia have discovered that the motorcycle was allegedly used to shoot a Palestinian scientist in Kuala Lumpur, the head of the national police said on Tuesday.
Fadi Mohammad al-Batsh, 35, killed in a hail of bullets by two attackers on Saturday as he walked to a mosque for dawn prayers.
Batsh's family, a member of the Islamist militant group Hamas, who is said to be an expert in rocket-making, has accused the Israeli Mossad spy agency of carrying out the murder. Israel has denied the claims.
Kuala Lumpur police have launched a search for the couple and have published photographic photographs of the two suspects, light-skinned men and beards.
The head of the national police Mohamad Fuzi Harun said that the motorcycle allegedly used by the assailants was found in the Setapak area of Kuala Lumpur.
"The motorcycle is in good condition," he told reporters, without giving further details
Police previously said they believed it was a BMW or a Kawasaki. It was used in the attack.
It is believed that the Mossad had killed Palestinian militants and scientists in the past, but it rarely confirms such operations.
Batsh's experience in making weapons could have made it a goal: militants ruled by Gaza Hamas regularly fire rockets into southern Israel, usually without causing casualties.
But Israeli Defense Minister Avigdor Lieberman on Sunday denied claims of participation by the Jewish state, suggesting instead that it was a "settling of accounts" between the factions of a terrorist group.
It was the second high profile murder of a foreigner in Malaysia in just over a year.
In February 2017 the assassins stained the forbidden nerve agent VX in the face of Kim Jong Nam, the half-brother distanced from the leader of North Korea, at the Kuala Lumpur International Airport, killing him in a matter of minutes.
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