Immigration director-general, Datuk Mustafa Ibrahim said
"An Immigration officer handled the foreigner's entry rejection process based on the stipulated standard operating procedure.
"According to the international procedure, individuals whose entry into a country has been rejected, should be sent back to the airport from which he had departed to enter that country, and not to any other destination.
"He (Wong) was sent back to Hong Kong via flight KA634 at 12.50pm today," Mustafa said in a statement.
The 18-year-old student activist was scheduled to attend a forum titled, "The Uprising of Youth and New Social Activism in Singapore and Hong Kong", at Auditorium A in Komtar, Penang, last night.
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Student activist Joshua Wong denied entry
He was also scheduled to attend more forums in Ipoh, Johor Bahru and Kuala Lumpur.
Wong was among the activists behind the massive demonstration that went on for 79 days last year, demanding for free elections to be held in Hong Kong.