Bangladesh has been experiencing heat waves across the country, with a high of 41.5 degrees Celsius in Chuadanga on Friday
Thakurgaon Correspondent Ali Ahsan Habib said calls had been made on his mobile phone from several numbers since Wednesday evening.
The callers abused him, he said.
The first call was made at 8:39pm.
“Why do you care when we kill atheists?” one caller told Habib.
He received calls from several numbers afterwards. The callers threatened to beat him, he said.
Habib said RAB's ASP Rakib Ahmed assured him that necessary steps will be taken.
Ananta Bijoy Das was hacked to death on Tuesday morning.
A group called Ansarullah Bangla 8 claimed Al-Qaeda’s Indian sub-continent unit had carried out the murder.