The arrest was the first known case of anyone being detained for reading as a form of protest since the military seized power last month.
Handfuls of anti-coup protesters have staged several silent readings of the classic book elsewhere in the capital in recent weeks because they say its indictment of totalitarianism has become relevant after the army deposed the nation's elected government in a May 22 coup.
The officer spoke on condition of anonymity because he is not authorised to give information to the media.
A Thai reporter who witnessed the lone man reading Orwell's book said he was taken away by half a dozen plainclothes police. The reporter, who asked not to be identified because of the sensitivity of the situation, said the man first read the book quietly, then held it up as officers approached and journalists took photos.
Several other people were also detained in the shopping mall's food court for preparing to hand out sandwiches, mimicking another recent protest in which a small group of student activists from Bangkok's Thammasat University gave out that said were "sandwiches for democracy."
The eighth arrest was of a woman wearing a T-shirt with the words "Respect My Vote" on it. The phrase became popular among pro-democracy groups trying to counter anti-government protesters who obstructed elections Feb 2 that were later annulled in a controversial court ruling.
