A bomb exploded near a crowded bus station, critically wounding at least three people in India's insurgency-wracked northeast on Friday, the second such blast in the area in three days, police said. The improvised explosive went off in the heart of Gauhati, the capital of Assam state, where the separatist United Liberation Front of Asom, or ULFA, has been waging a bloody battle for autonomy, said Rajen Singh, a police official. Details were not immediately available. It was the second such explosion in Gauhati in the past three days. Two people were killed and another 14 wounded in Wednesday's blast. No group has claimed responsibility for either blast, although police suspect the ULFA, who are also believed to be behind the killings of more than 60 people, most of them migrant laborers, earlier this month.