1. Malaysian military officials said it was unclear whether the unidentified craft was Flight 370.

2. It remained unclear after his return whether he will even be allowed to cast a ballot on June 28.

3. It was unclear how many people were in or near that area at the time.

4. Police said it was unclear if the men were members of the military.

5. It was still unclear Friday how many people were involved in the attack.

6. It is also unclear who could or would take her job.

7. It is unclear if the charges are related to one or both of the breaches.

8. It was unclear if the case is related in any way to other known cyberattacks.

9. It remains unclear whether she was still alive when she was set on fire.

10. It is unclear how quickly or even whether Google will respond to the most recent complaints.

11. The potential impact of the American investigation is unclear at this early stage.

12. It remains unclear if Google is also working directly with the service providers.

13. It was unclear how much revenue the new offering is expected to generate.

14. It is unclear how many iPhones that would keep from the market.

15. It is unclear if any of those measures have yet been implemented.