By Genalyn Kabiling Government forces must further step up security measures to prevent a repeat of the blast carried out by a suspected suicide bomber in Sulu, a Palace official said Tuesday. Presidential Spokesman Salvador Panelo (PCOO) Presidential Spokesman Salvador Panelo acknowledged that the latest bombing incident in the south was a “matter of concern.” "Anything that will show a rise in terrorism in any area of this country is always a matter of concern and we hope our security will improve more on their devices to stop this,” Panelo said during a news conference at the Palace. "But you know sometimes if it is a suicide bomber, it's difficult. I'm sure they are doing everything to stop it," he added. Authorities have launched an investigation into the bombing incident near a military detachment in Indanan, Sulu last Sunday. Initial reports indicated that the attack was reportedly launched by a female suicide bomber. The military suspected that the Abu Sayyaf Group could be behind the latest attack near its camp. Sulu is a known stronghold of the Abu Sayyaf, an Islamic state-affiliated group notorious for  kidnap-for-ransom and murder in the south. Admitting that Filipinos were "in danger,” the President recently directed the military to finish off the "crazy" Abu Sayyaf group for sowing terror in the south. The President said the nation does not need brutal human beings like the Abu Sayyaf militants who do nothing but to kill and destroy. "If they can exhibit that kind of brutality, finish them off because we do not need that kind of human beings with us. We have been out to make peace with them," he said during his visit to Leyte last July.