SHILLONG, April 19: The BSF today peacefully regained control over the Pyrdiwah observatory post in Meghalaya when Bangladesh Rifles occupying it since Monday, pulled out and guns fell silent in Mankachar area after a ceasefire was agreed upon, BSF Inspector General (HQ) V K Gaur said, reports PTI. The impasse was resolved a day after the killing of 16 BSF personnel by the BDR at Boribari in Assam. BDR resumes firing: Breaking a luss of three hours, Bangladesh Rifles resumed mortar fire on Indian positions this evenin wounding one civilian at Thakurianbari village of border district Dhubri, Deputy Commissioner Gayatri Baruah said. BSF and BDR personnel were engaged in "low-scale" exchange of fire near the village till late tonight, she told PTI.