Three persons were killed and at least four others injured during a clash over making 'offensive comments' on Facebook, at Kapasia upazila in Gazipur district on Saturday night.
Kapasia police, however, detained two people in connection with the incident.
The deceased were Nayeem Hossain, 18, Farruq Hossain, 26, and Rabin, 16.
AFM Nasim, officer in charge of Kapasia Police Station said that a clash ensued between two groups of youths of Dakkhingaon Chopara village under Sonmania union and Daulatpur area in Monohardi upazila around 11:30 pm.
"Two youths Belayet, 23, and Faysal have been detained in this incident", he added.
Both groups used machetes and stabbed each other indiscriminately, leaving seven to eight people injured.
Critically injured persons were taken to Monohardi Upazila Health Complex where the on-duty doctor declared Nayeem Hossain and Farruq Hossain dead.
The other injured were shifted to Gazipur Shaheed Tajuddin Ahmad Medical College and Dhaka Medical College Hospital (DMCH).
Injured Rabin succumbed to his injuries on Sunday morning at DMCH.