The flood situation in Assam was grim on Sunday, with waters inundating vast areas of human habitation and crops following incessant rains that lashed the state for the past week.

Official reports reaching Guwahati said the Brahmaputra and almost all its tributaries were flowing above the danger level, forcing people living in low-lying areas in lower and upper Assam to move to higher ground.

The situation was also grim in south Assam's Barak Valley, where the Barak River and its tributaries, Katakhar and Kushiara, were flowing above the danger mark.

According to sources in the Central Water Commission, the Brahmaputra was flowing above the danger mark at Dibrugarh, Naematighat, Tezpur, Dhubri and Goalpara.

The flood situation in Barpeta district was serious as all rivers there were in spate and the Manas National Park, a national heritage site, was under water, forcing animals, including the endangered one-horned rhino and Royal Bengal tigers, to flee to safer places.