A man hacked five people to death in Debidwar upazila of Cumilla on Wednesday morning before being killed by the mob.
The man, identified as Mokhlesur Rahman, committed the massacre around 10:30 in the morning in Radhanagar village of the upazila.
The deceased are Anwara Begum, 40, her son Abu Hanif, 12, Nazma Akter, 36, her mother-in-law Mazeda Begum, 55, all from the Radhanagar village and wife of a certain Bajlu Mia from the Pukuria village in the upazila.
Debidwar police station officer-in-charge Zahirul Islam said the man was a drug addict. He first hacked Abu Hanif while he was working in the farm field. Later, he stabbed four others one by one.
Two others were injured in the attack by the man who was later killed by the local people, the OC added.