A 30-metre earthen section of the Hasnapara Spur collapsed into the Jamuna River in Hatserpur Union of Sariakandi upazila, Bogura, early Thursday. Strong river currents and a vortex caused the damage at the spur, according to the Bangladesh Water Development Board. The river level at the Sariakandi point has remained close to the danger mark for the past several days.

The Water Development Board said a newly emerged char upstream of Hasnapara No. 2 Spur, on the riverside, altered the water flow toward the country side. The redirected current struck the spur and created a vortex, leading to the collapse of its earthen base. Residents living in the area are reported to be worried by the erosion.

Sub-divisional engineer Sohel Rana said the shifted flow was hitting the spur's soil foundation because of the upstream char formation. To contain the erosion, authorities are placing sand-filled geobags and geotubes at the affected location.