The Army staged a flag march in Guwahati today.

The ULFA has called a bandh in Assam for seven hours starting 5 am tomorrow, apart from a two-hour black-out from 6 pm to 8 pm. The ULFA is also party to a joint boycott call given earlier by five other rebel groups of the North-East, including the National Socialist Council of Nagaland (NSCN-K).

In Guwahati, apart from the Army, Black Panther commandoes of Assam police have also been deployed to keep vigil against attempts to disrupt the Independence Day celebrations.

Security has also been beefed up at important industrial installations, the Duliajan-Barauni crude pipeline, railway tracks, and bridges on the Brahmaputra.

Special arrangements have also been made to provide additional protection to schools, offices and otherinstitutions of the hilly region.

Police said the ULFA might attempt to cause chaos by blasting bombs and targeting VIPs with an aim to scare away the public from taking part in Independence Day functions.

The Army has been put on standby in Guwahati city to assist civil authorities in case of any emergency and additional troops have also been moved in, officials said.

Meanwhile, rebels armed with sophisticated weapons attacked the Borbori police station in Nalbari district last night. No casualty has been reported. In Dibrugarh, a surrendered ULFA member Rubul Gohain was shot dead by ULFA rebels today morning.

However, Assam Chief Minister Prafulla Kumar Mahanta has termed as ``false'' the ULFA claim of using rockets to attack the Indian Oil Corporation's Thekeraguri depot where the fire is yet to be contained.

``The ULFA claim is false as there is no evidence of any rockets being used,'' Mahanta said after visiting the spot.

The evidences strengthened the suspicion that the fire might be a caseof ``internal sabotage'', Mahanta said.

The Chief Minister, however, said an inquiry was being carried out and unless the findings were available, it could not be said that the ULFA was involved.

The ULFA in a press statement had claimed that rockets of US-make were used by it to destroy the seven tanks of the IOC.