SUSPECTED TAMIL TIGER REBE DETONATED A BOMB IN A BUSY STREET IN NORTHEAST SRI LANKA ON MONDAY, KILLING FOUR MEMBERS OF THE SAME FAMILY AND A NAVY OFFICER, ADDING TO CONCERNS THAT THE ISLAND NATION COULD FALL BACK INTO CIVIL WAR. THE REBELS ALSO ATTACKED A NAVY SHIP OFF THE PORT CITY OF TRINCOMALEE, WOUNDING AT LEAST FIVE SAILORS BEFORE THE NAVY RETURNED FIRE, CAUSING A REBEL SHIP TO CATCH FIRE, SAID COMMANDER D. K. P DASSANAYAKE, A NAVY SPOKESMAN. IT WAS UNCLEAR IF THERE WERE REBEL CAUSALITIES, THE ASSOCIATED PRESS REPORTED.