LONDON (Dow Jones)--London Security PLC (LSC.LN) said Thursday it purchased 11,100 ordinary shares of 1 pence each in the Company for cancellation at a price of 800 pence per share. -Shares at 1530 GMT up 12.5 pence, or 1.59%, at 800.0 pence. -By Iain Packham, Dow Jones Newswires; 44-20-7842-9269; [email protected] (END) Dow Jones Newswires June 17, 2010 11:31 ET (15:31 GMT)