A statement issued on Monday by the Waad political society in Manama said its deputy head Abdulla Janahi was interrogated for hours.
The official said Janahi was barred from entry on Saturday upon the request of a security agency, but said he was allowed to move freely inside the transit hall until his departure. The official spoke anonymously as he is not authorized to brief the media.
Last year, another prominent Bahraini activist was barred from Egypt.
Bahrain has seen nearly three years of unrest, pitting mostly Shiite protesters against its Sunni rulers.
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Associated Press writer Reem Khalifa in Manama contributed to this report.
