11.   Police offered no motive for the shooting.

12.   Police had no reports of domestic violence at the Hartman home and could offer no motive for the shootings.

13.   Police offered no motive for the shootings.

14.   The government has officially offered no motive for the killing of Ruiz Massieu.

15.   The police also gave a fuller account of the shooting, but did not offer a motive.

16.   The police did not offer any motives for the shootings and would not say where the three had been arrested.

17.   The police offered no motive for the shooting.

18.   The Secret Service offered no motive for the suspect, identified as Francisco Martin Duran of Colorado Springs, Colo.

19.   Though officials said he had been strangled, they gave few other details and offered no motive for his killing.

20.   Police did not offer any motives for the blast.