Guwahati, Aug 3 - A major disaster was averted Monday with police recovering a powerful explosive fitted with a programmable time device meant for a terror strike in Assam's main city of Guwahati.

A police spokesperson said the nearly one-and-a-half kilogram bomb was recovered from an undisclosed location early Monday.

'It was a PTED (Programmable Timed Explosive Device) containing RDX packed in a plastic container and was meant for explosion in Guwahati ahead of Independence Day,' senior police official Debojit Deuri said.

'For security reasons we would not like to divulge details from where we recovered the explosive as we have inputs of at least two more bombs in Guwahati.'

In another development, police in Dhemaji district in eastern Assam warned of a joint attack by the ULFA and the outlawed National Democratic Front of Bodoland (NDFB) in the run up to Independence Day.

'We have definite information of the ULFA and the NDFB planning to stage serial explosions in the district ahead of Aug 15 with a seven member team engaged for the attack.