1. The motive for the attack and those behind it are unclear.

2. Police have not determined a motive but said this is not an act of terror.

3. They have not named a motive or said what relationship he has to the dead.

4. No arrests have been made and no motive has been established for the crime.

5. There was no immediate sign of a political or other motive for the robbery.

6. There was no immediate word on a motive or possible charges against the teen.

7. Police have released no public word about their investigation, or a possible motive for the crash.

8. Police have not given a possible motive for the shootings.

9. Police have declined to comment on a motive for the slaying.

10. Police are still trying to confirm a motive in the shootings.

11. No arrests have been made, and the motive for the attack is unclear.

12. Authorities have not identified a motive but said an investigation is ongoing.

13. The incident was still under investigation and a motive has not been determined, police said.

14. The identities of the women were not immediately released, and no motive was evident.

15. Authorities have not disclosed a motive for the shooting and say they have ruled out nothing.