1.   Investigators have yet to establish a motive, but a failed robbery attempt is a likely reason, Moen said.

2.   So far the police have been unable to establish a motive for the murder.

3.   So far the police have been unable to establish a motive for his murder.

4.   No motive was established or suggested.

5.   No motive has been established for the attack.

6.   Chief Superintendent Louis Munn said police were still trying to piece together exactly what happened and establish a motive for the attack.

7.   Detectives are also still trying to establish a motive for the crime, Gluck said.

8.   Establishing a motive, however, may take longer.

9.   In the Allentown cases, no motives have been established.

10.   Investigators have established a motive, but they have declined to comment.