The sound of the explosion at Maligaon was heard over two kilometres away and many residents here complained of deafness for several hours afterwards.
The bomb, suspected to have been kept in a car in busy Maligaon Chariali near the North East Frontier Railway headquarters, ripped through the parking lot in front of a restaurant killing seven people and injuring 61 others.
A panic-stricken man, identified as Ramesh Deka, jumped to death from the roof of a three-storey commercial building where a fire broke out after the blast, which also set ablaze over 20 motorbikes and cars in the parking lot.
Panic-stricken people in the building rushed to the roof after the fire.
The people were angered as there was delay in the arrival of ambulances and the fire brigade and attacked the police.
"Blasts have become a regular feature in Assam, particularly in Guwahati, but police and security personnel remain apathetic to the condition of the common people who suffer the most in such incidents," said an angry 40-year-old Hemanta Kalita.
The ULFA strikes before Independence Day, Republic Day, Army Day, Martyr's Day and the outfit's own 'Raising Day'.