A series of four bomb explosions by suspected rebel outfits rocked upper Assam's Charaideo and Dibrugarh districts on Sunday morning as the state celebrated the country's 71st Republic Day.

• First blast: Teok haat, Sonari
• Second blast: Near Duliajan Police station
• Third & fourth blast: Marwari Patty, Graham Baazar (Dibrugarh)
• Fifth blast: Dumduma 8 no. bridge

There was no casualty or injury in any of the explosions, police said.