An obscure Islamic militant group warning of "the terror of Death" took credit for synchronized bombings that killed at least 45 people in western India - the second series of blasts in India in two days. "In the name of Allah the Indian Mujahideen strike again! Do whatever you can, within 5 minutes from now, feel the terror of Death!" said an e-mail from the group sent to several Indian television stations minutes before the blasts began. The pair of attacks put India on alert Sunday and security was stepped up at markets, airports and hospitals across the country. Investigators, meanwhile, scoured Ahmadabad, detaining 30 people for questioning in the ancient city that was hit by 16 bombs around dusk Saturday, said the city's police commissioner, O.P. Mathur. Police also found and defused an unexploded bomb.