16 blasts in ahmedabad..

The no of blasts increased and the blasts had been well planned. As the sources of the news channel cnn/ibn and ndtv say, first blasts occurred between 6.45 to 7.15(approx) and the last blasts were around 8.15. what is the reason for the time delay.. That too the last blasts were targeted outside the hospitals and the reports say that the bomb was planted in a car inside the govt hospital and it flew to a height of 50ft from the ground when the blast occurred... the injured from the first blast will be taken to anyone of the hospitals .. what type of design is this???