The ethnic Tamil bomber who blew herself up targeting Sri Lanka's top general was pregnant, and that helped her to conceal explosives and get inside army headquarters for a maternity check, an investigator says. The brazen, meticulously planned attack on Tuesday triggered reciprocal military action by both government troops and the Tamil Tiger rebels, pushing Sri Lanka close to civil war after a tense four-year ceasefire. The bomber has been identified as 21-year-old Anoja Kugenthirasah from Vavuniya, a government-held northern town near Tiger-held territory. She is believed to have been a member of the rebels' Black Tigers suicide squad, the investigator said. The investigator, who cited hospital records, spoke on condition of anonymity.