"The exact causes are unknown," said Dr. Gilles Lavigne.
We stepped out into the unknown," said Smith.
The extent of his injuries remains unknown, said Capt.
"Overall, the motivation behind the installation of these particular mobile applications remains unknown," said Calvet.
"We're heading toward the unknown," said Talal Atrissi, a political analyst in Lebanon.
There were casualties, but the numbers were unknown, said the deputy police chief, Gen. Daoud Amin.
"Tap into your breath to deal with the unknown," said Amanda Richter, a YogaHope teacher.
"In essence we are heading toward the unknown," said Abbas Zaki, 63, a member of Fatah's influential Central Committee.
He had been treated recently for pneumonia, but the immediate cause of death was unknown, said his wife, Carol Deford.
"In some cases, they could be sympathisers or followers that republish horrifying display," the man, whose name is unknown, said.
There is fear of the unknown," said Yolanda Langston, the president of a Service Employees International Union's local in Detroit.
