21.   That is one of the factors being considered as detectives try to determine a motive.

22.   The authorities say they have yet to determine a motive.

23.   The authorities would not say whether they had determined a motive.

24.   The boys, their parents and the Bermudez family were all questioned Tuesday, but officers had not determined any motive for the attack, Walter said.

25.   The police had no suspects and had not determined a motive for the crime Thursday.

26.   The police said they had no suspects and had not determined a motive for the shooting.

27.   The police have not determined a motive in the slaying.

28.   There was no evidence of a robbery, and while the police have not determined the motive, they have notified the FBI, which investigates hate crimes.

29.   Was their motive ever determined?

30.   While investigators have yet to determine any motive for the killings, they suspect that they are racing the clock.