Officials say up to 100 armed militants and an unknown number of students remain inside.
About 31 Japanese companies had offices in the buildings employing an unknown number of staff.
There could be an unknown number of other sports pitches that have been lost, it said.
Guns from the operation have also been linked to an unknown number of Mexican civilians' deaths.
The other unknown number is the probability that a rape will lead to pregnancy.
An unknown number of Khmer Rouge cadres were simply lynched during the Vietnamese invasion of Cambodia.
That unknown number quite possibly being higher than the jobs created that we can see.
FORBES: If Apple Onshored iPad Production it Would Create 67,000 American Manufacturing Jobs!
Nine Iraqi soldiers and an unknown number of Ministry of Interior personnel have been injured.
Although many are runaways and don't wish to be found, an unknown number might have been abducted.
Then there would be an unknown number of deaths from cancers that would develop in future years.
Bitter, because Hurricane Sandy caused the deaths of thirty-eight people, and an unknown number have lost their homes.
FORBES: After Hurricane Sandy, Manhattan Business Is...Booming?
Particularly worrying for Western security planners, many of these groups have attracted an unknown number of foreign fighters.
An unknown number of brown long-eared and common pipistrelle bats are living in disused buildings on the site.
Ever get a text message from an unknown number that asked if you were interested in a certain service?
Officials say the death toll could rise as an unknown number of people are still buried in the debris.
The flow of people in from the countryside means that they now bustle with an unknown number of citizens.
Local media said six police and an unknown number of demonstrators were injured.
Some three thousand people, including an unknown number of civilians, are believed to have died in targeted strikes since 2001.
Thousands of people and scores of companion animals remain missing or injured, while an as yet unknown number are dead.
And they will be guaranteeing war that will claim the lives of an unknown number of Israeli civilians and soldiers.
The evidence so far indicates that apo E is one of an unknown number of "housekeeping genes, " says Allen D.
WSJ: A Gene Gives a Hint Of How Long a Person Might Hope to Live
It might, possibly, create 67, 000 that we can see, but it will also destroy some unknown number that we cannot see.
FORBES: If Apple Onshored iPad Production it Would Create 67,000 American Manufacturing Jobs!
An unknown number of Soviet civilians perished in the to-and-fro of the armies, and in the ruins of the city (present-day Volgograd).
Of the dissidents who have not departed Hong Kong for a third country, an unknown number have quietly integrated into the society.
Eight Iraqis also died, and an unknown number of people were wounded.
An unknown number of Buddhists, meanwhile, sought refuge inside the city's shrines.
The Airbus A320 was carrying 147 passengers and an unknown number of crew members, according to the National Transportation Safety Board.
CNN: Crew of wayward airliner cooperative, sober, police say
Thirteen people have gone on trial in Algiers, accused of trafficking an unknown number of Algerian children to the French city of Saint-Etienne.
BBC: Algeria-France child trafficking trial opens in Algiers
They now use Portuguese workers, about 2, 000 of whom live in Boston, plus an unknown number of others from Iraq and eastern Europe.
An unknown number of job seekers answering that ad became victims of robberies that in some cases turned violent, say federal and local investigators.
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