A top official says that investigators are examining forensic evidence and footage from closed circuit televisions for clues about the triple bomb blasts that shook India\'s business hub of Mumbai and killed 17, according to AP. Chief Minister Prithviraj Chavan told CNN-IBN news channel on Friday that investigators had collected evidence such as blood samples and explosive materials from the bombing sites and were also analyzing security footage for more clues into the attacks. No one has claimed responsibility for Wednesday\'s attacks and investigators have named no immediate suspects.