A series of blasts exploded in crowded markets in India's remote northeast on Wednesday, killing two people and injuring at least 100.

The first of four blasts went off at 7:30 p.m. when markets in Agartala, the state capital of Tripura, were packed with shoppers during the Muslim holiday of Eid al-Fitr and ahead of a Hindu holiday on Thursday.

Three more blasts went off at nearby markets over the next 90 minutes, said senior police official Shreyesh.

The blasts killed two people and injured at least 100, said Shreyesh, who uses one name. He added that 20 victims are in critical condition.

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There are two separatist militant groups in the remote state of Tripura who have clashed with police in the past. Shreyesh said it was too early to say if they were responsible for the blasts.

The groups, All Tripura Tiger Force and the National Liberation Front of Tripura, have been relatively quiet in recent years.

Shreyesh said police are investigating whether the bombers came across the long and porous border Tripura shares with Bangladesh.

India has been hit by a spate of recent bomb attacks. The latest explosions killed six people and wounded 45 others Monday night in the western cities of Malegaon and Modasa.