The official sources said that the river breached its embankment in a stretch of 40 - 50 metres at Tajpur under the Runnisayedpur block, flooding vast areas and several villages in eight panchayats of the district.
As reports came in, Nitish Kumar, Chief Minister held a high level meeting with state Water Resources minister Vijendra Yadav, Principal Secretary (Water Resources) M R Nayak, besides Principal Secretary (Disaster Management) and other senior officials.
An official spokeman said, "Kumar ordered immediate deployment of NDRF in the affected areas to step up relief and rescue operations." He also said that the NDRF personnel would reach the site within hours with necessary equipment.
Sources said an estimated one lakh people were hit by the floods, adding reports of four to five children being swept away in the swift currents were being verified.
Sources also said that road communication between Muzaffarpur and Sitamarhi was likely to be affected as flood waters submerged the National Highway near Koati, about 17 km from here.