P245 CEEFAX 245 Fri 6 May 21:13/14    WALL STREET    (Midday): Stocks weakened furth u after seeing some bu ink interest return mid-morning.  Further falls on the bond market incited renewed selling of stocks, dealers said, with many investors remainin id lin d until the F d tightened rates again as is widely anticipated.  * hj US jobless rate stood at 6.4% in April, down from 6.5% in March. Non-farm payrolls rose bz 267,000 after a revised 464,000 March gain.  World indices 243 Dow Jones 242 Euro/East Dow Jones Exchanges World Ind