© Ahmad Yusni/EPAPolice in Kuala Lumpur said Hamza Kashgari was detained at the airport following a request by Interpol on behalf of the Saudi authorities.
Interpol has been accused of abusing its powers after Saudi Arabia used the organisation's red notice system to get a journalist arrested in Malaysia for insulting the Prophet Muhammad.
Police in Kuala Lumpur said Hamza Kashgari, 23, was detained at the airport "following a request made to us by Interpol" the international police cooperation agency, on behalf of the Saudi authorities.
Kashgari, a newspaper columnist, fled Saudi Arabia after posting a tweet on the prophet's birthday that sparked more than 30,000 responses and several death threats. The posting, which was later deleted, read: "I have loved things about you and I have hated things about you and there is a lot I don't understand about you ... I will not pray for you."
More than 13,000 people joined a Facebook page titled "The Saudi People Demand the Execution of Hamza Kashgari".
Clerics in Saudi Arabia called for him to be charged with apostasy, a religious offence punishable by death. Reports suggest that the Malaysian authorities intend to return him to his native country.
Kashgari's detention has triggered criticism by human rights groups of Malaysia's decision to arrest the journalist and of Interpol's cooperation in the process.
Jago Russell, the chief executive of the British charity Fair Trials International, which has campaigned against the blanket enforcement of Interpol red notices, said: "Interpol should be playing no part in Saudi Arabia's pursuit of Hamza Kashgari, however unwise his comments on Twitter.
"If an Interpol red notice is the reason for his arrest and detention it would be a serious abuse of this powerful international body that is supposed to respect basic human rights (including to peaceful free speech) and to be barred from any involvement in religious or political cases."
He called on Interpol to stand by its obligations to fundamental human rights and "to comply with its obligation not to play any part in this case, which is clearly of a religious nature".
Interpol, which has 190 member countries, has a series of coloured notice systems that police forces around the world use to pass on requests for help. Contacted at its headquarters in Lyon, France, the organisation did not immediately reply to requests for comment on the Kashgari case.
In response to past criticisms of the red notice system, it has said: "There are safeguards in place. The subject of a red notice can challenge it through an independent body, the commission for the control of Interpol's files (CCF)."
Last year Interpol was accused by Fair Trials International of allowing the system to be abused for political purposes when it issued a red notice for the arrest of the Oxford-based leader of an Asian separatist movement, Benny Wenda, who has been granted asylum and has lived in the UK since 2003.
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