removing outdated news files

[jack]

following the expire man file I have attempted to do the following command

find /usr/spool/news -size 0 -o -mtime +90 -exec rm -f {} ; expire -r

find returns the following error message:
find: incomplete statement

Where have I gone wrong? Is there some better way of eleminating old
news articles that expire ect. has lost track of? A visual inspection of 
the news partition shows that there are a lot of files that have been lost 
track of. 

THe important stuff is sco xenix 386 2.3.2 and bnews version B 2.11 
compiled by SCO. Patch level of Bnews is unkown
Thanx Jack
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