21.   So far, there is no official explanation for the crime, although the unofficial speculation has begun.

22.   Shopping centers in the district were closed Friday with the official explanation that workers needed to do maintenance.

23.   Shopping centers in the district were closed Saturday with the official explanation that workers needed to do maintenance.

24.   Some Chicago Catholics questioned this official explanation.

25.   The administration has asked the Chinese for an official explanation through diplomatic channels, but has not received a response, senior State Department officials said on Wednesday.

26.   The Association of Independent Electronic Media said the official explanation for the dismissals was that the employees had not turned up for work.

27.   The crash of the Cameroon Airlines flight has still not been given any official explanation.

28.   The FBI gave no official explanation of the rift.

29.   The Indians and Pakistanis did not answer questions Monday night or Tuesday morning about the summit meeting or give any official explanations of what went wrong.

30.   The official explanation is that the cows were probably fed tainted grain.