21.   Police were still investigating their origin.

22.   Police said they were investigating the origin of an article published Wednesday saying that some government lawmakers had demanded the resignation of the entire cabinet.

23.   Specialists of the Black Sea Research Institute, who investigated the origin of the oil, said it comes from ships washing it out at sea.

24.   Thanit says his unit does not have the resources to investigate the origins of ivory items.

25.   The Emergency Situations Ministry described the reports as a canard and said it would investigate their origin.

26.   The U.N. was investigating the origin of fire.

27.   A special commission was investigating the origins of the blaze, Interfax said.

28.   Authorities are now investigating the origin of millions of dollars he held in US bank accounts.

29.   While officials investigate the origins of the press release, Humphreys withheld comment on the affair.

30.   Police are investigating the origin of the forged passport and other belongings, the reports said.