Dhaka: Despite Prime Minister Sheikh Hasina's strong instruction to law enforcement agencies to unearth the mystery behind the killing of Gaibandha-1 ruling lawmaker Manjurul Islam Liton, there has been no visible progress in the probe into the sensational murder case over the last one week.

‘We're carrying out the investigation with a primary idea that a family feud might have led to the murder of the lawmaker. But we still didn't get any specific information in this regard,’ an intelligence official said wishing anonymity.

He said they are making their all-out efforts to unfold the real reasons behind the killing as soon as possible.

Awami League MP Manjurul Islam Liton was shot dead at Bamandanga village in Sundarganj upazila of Gaibandha on December 31.

On Wednesday, Prime Minister Sheikh Hasina asked the law enforcement agencies to track down Liton's killers immediately.

‘Killing an elected public representative in such a way can never be allowed, and the trial of this killing (MP Liton's) will definitely be held on Bangladesh soil. I've already directed the law enforcement agencies to hunt down the killers,’ she said while addressing the people of all strata of Rangpur division through videoconferencing from her official Ganobhaban residence in Dhaka city.

Talking to news agency UNB, Sundarganj Police Station Officer-in-charge Atiar Rahman said though they are yet to get any clue about the murder, they hope they will able to debunk the mystery behind it very soon.

Assistant Director of Rapid Action Battalion (RAB-13) Habibur Rahman admitted that they could not make any tangible progress in the investigation into the case as of Saturday evening.

Tahmida Bulbul Kakoli, Liton's younger sister and also the plaintiff of the murder case, told UNB that she along with her some other family members left their village home for their Dhaka home on Wednesday on security ground.

‘We're suffering from a sense of insecurity. That's why we left our village home,’ she said.

Earlier on Monday, Khorshed Jahan Srity, the wife of the slain MP and their only son, left Sundarganj for the capital on the same ground.

Contacted, Srity voiced her dissatisfaction over the lack of progress in the investigation of the case. ‘It's frustrating that law enforcers could not make any progress into investigation of the case, even after the Prime Minister's directives to this end.’

She suspected that Jamaat-Shibir activists might have killed her husband for his strong stance against their party.

Meanwhile, police arrested 12 leaders and activists of Jamaat-Shibir from Dumerhat Nijpara village under Sundarganj upazila on Friday night.

Of them, six Jamaat men will be produced before court with a seven-day remand prayer on Sunday to extract information from them about the murder, the Sundarganj Police Station OC said.