Dhaka, June 20 -- Authorities have issued a short-term flood warning for four northern districts of Bangladesh as heavy rainfall pushes up river levels across the region.

The alert covers Nilphamari, Lalmonirhat, Kurigram and Rangpur, where water levels in major rivers are rising, the Flood Forecasting and Warning Centre (FFWC) said on Saturday.

On Saturday, FFWC Assistant Engineer Nusrat Jahan Jerin said river levels in the Teesta, Dharla and Dudhkumar have risen due to rainfall and may continue to increase for at least three days.

A bulletin issued at 9am on Saturday said river levels had already increased over the previous 24 hours and are expected to keep rising for the next 72 hours.

It warned that these rivers may flow above dan...