Anatomy of a Hong Kong police stop-and-search operation:

Right now, >100 people are detained in Causeway Bay (2+ locations). By the looks of it, not all will be arrested & some will be let go. But note their attire and belongings: none appear to be black-clad "radicals".
Appears I was too optimistic. Of this round-up, a small initial batch was allowed to leave. But dozens are presumably arrested and taken onto police vehicle: exact number unclear, but it took at least 2 vans.
#Now: different location, similar strategy. Police have detained another 50+ people outside of Langham Place in Mong Kok for stop-and-search.

Sources at the scene say that police have told detainees to face the wall, so that media can't capture their faces.
From a closer angle:

These people were detained approximately half an hour ago (15:00), when riot police made a charge in Mong Kok around Nathan Road and Langham Place.
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