The 2010 Commonwealth Games in India next month were supposed to highlight Delhi's development, but attacks on tourists and infrastructure woes may have hurt the country's image.
The government warned of more attacks Monday after Naxalites called a two-day strike to protest an offensive in Lalgarh, West Bengal.
Police have arrested the head of Indian Mujahideen, which claims responsibility for recent bombings.
Islamic militants claim to be targeting Indian cities to stoke communal tensions.
Seven synchronized bombs exploded in the city of Jaipur Tuesday evening.