A BOMB EXPLODED IN THE MAIN CITY OF GEORGIA'S BREAKAWAY REGION OF SOUTH OSSETIA ON FRIDAY, KILLING TWO PEOPLE AND WOUNDING TWO OTHERS, A GOVERNMENT OFFICIAL SAID, ACCORDING TO AP. A HOMEMADE EXPLOSIVE DEVICE PACKED WITH NAILS AND METAL BALLS WAS PLANTED IN A TREE NEAR AN APARTMENT BUILDING IN TSKHINVALI AND DETONATED AROUND 9 A.M. (0500GMT), SAID IRINA GAGLOYEVA, SPOKESWOMAN FOR SOUTH OSSETIA'S UNRECOGNIZED GOVERNMENT. THE BLAST LIKELY TARGETED A MILITARY COMMANDER WHO ALSO SERVES AS A LAWMAKER IN THE REGIONAL LEGISLATURE AND LIVES IN THE BUILDING, SHE SAID. TWO WORKERS ON A PASSING CARGO TRUCK WERE KILLED, AND TWO OTHERS WERE WOUNDED BY THE BLAST, WHICH GAGLOYEVA SAID RESEMBLED ONE THAT KILLED A TOP SECURITY OFFICIAL SEVERAL DAYS AGO.