KATHMANDU: A bomb exploded at the Transport Management Office in Lahan Municipality of Siraha district on Thursday afternoon.

The bomb exploded in the restroom adjoining the Office Chief's room on the first floor of the building destroying walls, windows, and furniture, according to the DSP Hira Pandey at the Lahan-based Area Police Office.

No human casualties were reported, informed the DSP Pandey

Police have found some materials used to make pressure cooker bomb. However, the culprits and their motivation behind the bomb attack are yet to be ascertained, said the DSP.

Further investigation is underway, said police.