A 70-year-old man and his 43-year-old son died after inhaling toxic gas in a septic tank at Udaykathi in Banaripara upazila of Barishal district on Sunday.

The deceased were identified as Abul Kalam Hawladar and his son Quamrul Islam.

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Quoting family members, Sub-inspector Osman Goni of Banaripara Police Station, said Abul Kalam built a new septic tank at his house. On Sunday, Quamrul was tasked to remove the water inside the septic tank.

While removing water through a bucket, the bucket fell inside the tank. Quamrul then went in the septic tank to get the bucket and fell unconscious.

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Getting no response from Quamrul, Abul Kalam also went into the septic tank and fell unconscious.

Later, local people recovered their bodies and took them to Swarupkathi Upazila Health Complex where the doctors declared them dead.