21.   Police are investigating the motive of the attack, Czech radio quoted police spokesman Josef Sulcek as saying.

22.   Police are investigating the motives of the bomber, a farmer surnamed Tian from Henan province, but believe he meant to commit suicide, Liu said.

23.   Police spokesman Shmuel Ben Ruby said police were investigating all motives, including the possibility that the explosive was planted by Jewish militants.

24.   Police were investigating the motive for the crime.

25.   Police were investigating the motive.

26.   Police were still investigating Kitaoka motives, but said they suspected mental illness.

27.   Police said they were investigating possible motives for the hit-and-run.

28.   Police were investigating the motives for the suicides, the spokesman said.

29.   Police were still investigating possible motives for the blast, but believed it may have been drug-related, Lund said.

30.   Police were still investigating the motive of the crime but said they suspected it was a robbery gone foul.