Their exact whereabouts are at present unknown.

BBC: Bosnia war: Main players

At present it is unknown what will be unveiled at this event, but we can reasonably assume that it will be toys.

FORBES: Angry Birds To Partner With 'The Force'

Forecasts by Analysys, a British consultancy, suggest that in ten years' time operators may depend on what are at present embryonic or unknown services for two-thirds of their revenue (see chart).

ECONOMIST: Only fakirs need apply

Its operational status is unknown at present, but appears mostly complete with obvious Russian-designed fuel elements.

FORBES: Israel Has Nuclear Weapons, But Only Iran Has Nuclear Power

At present, she is a Portuguese Podengo, a dog that to the best of my knowledge was previously unknown in Tennessee.

NPR: 'Dog is My Co-Pilot'