11.   Police do not think the girl was sexually assaulted but say they do not know the motive for the attack, in which she sustained severe head injuries.

12.   Police think they know the motive for the suicide, but will not discuss it.

13.   Police do not yet know the motive for the fire.

14.   Police said they know the motive for the killing but have declined to discuss it.

15.   Police said they did not know the motive, and detectives were still looking for the gunman Sunday night.

16.   Police say they do not know the motive and are looking for the gunman.

17.   She presumed to know the motives behind their ideas and dismissed them as people without religious convictions.

18.   The only people that know the motives were the actual shooters.

19.   They said they still did not know the motive behind the killings that shook the quiet, working-class block.

20.   Police did not know the motive for the attack and nobody has claimed responsibility.