The girl, identified as Sadia Nawshin, 16, daughter of Sultan Faruk Manju and Shamsunnahar, was tied with a scarf around her neck

Victim's mother Shamsunnahar suspected that somebody suffocated her daughter.

She found the body lying face down in a room next to a bathroom of their flat on the fourth floor of the six-storied building at Peyarabagh at 12:30pm.

With the help of the house owner, Shamsunnahar rushed Nawshin to Holy Family Hospital and later to Dhaka Medical College where the doctors declared her dead.

Shamsunnahar went to bring her son Rono home from school at Kakrail at around 11:30am keeping her daughter Nawshin alone in the residence.

On return she found the main door of her flat open and Nawshin dead.

The next door neighbours who rushed to the flat hearing Shamsunnahar's scream said they saw the mother untying the scarf from Nawshin's neck and crying.

Shajahan, a guard of the house, said he did not see anybody entering or going out during the incident.

"It is tough to determine whether it is a murder or incident of suicide before investigation," said A K M Daulat Akbar, officer-in-charge of Ramna Police Station.