Indian officials are investigating a bomb attack that killed at least eight people and wounded 60 others on a passenger train in the east of the country.

Police said Tuesday the blast in West Bengal state Monday could have been committed by the Kamtapur Liberation Organization.

The group is fighting to carve a separate homeland out of West Bengal and is said to have ties to rebels fighting for the independence of neighboring Assam state.

Officials say the bomb was planted inside a train carriage and went off near the Belacoba station, about 550 kilometers north of Calcutta, also known as Kolkata.

Some information for this report was provided by AFP, AP and Reuters.